Subject: memory leak in sctp_process_init

From: syzbot <[email-masked]>
Date: Mon, 27 May 2019 17:48:06 -0700

Hello,

syzbot found the following crash on:

HEAD commit:    9c7db500 Merge tag 'selinux-pr-20190521' of git://git.kern..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10388530a00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=61dd9e15a761691d
dashboard link: https://syzkaller.appspot.com/bug?extid=f7e9153b037eac9b1df8
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10e32f8ca00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=177fa530a00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: [email-masked]

  0 to HW filter on device batadv0
executing program
executing program
executing program
BUG: memory leak
unreferenced object 0xffff88810ef68400 (size 1024):
   comm "syz-executor273", pid 7046, jiffies 4294945598 (age 28.770s)
   hex dump (first 32 bytes):
     1d de 28 8d de 0b 1b e3 b5 c2 f9 68 fd 1a 97 25  ..(........h...%
     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
   backtrace:
     [<00000000a02cebbd>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:55 [inline]
     [<00000000a02cebbd>] slab_post_alloc_hook mm/slab.h:439 [inline]
     [<00000000a02cebbd>] slab_alloc mm/slab.c:3326 [inline]
     [<00000000a02cebbd>] __do_kmalloc mm/slab.c:3658 [inline]
     [<00000000a02cebbd>] __kmalloc_track_caller+0x15d/0x2c0 mm/slab.c:3675
     [<000000009e6245e6>] kmemdup+0x27/0x60 mm/util.c:119
     [<00000000dfdc5d2d>] kmemdup include/linux/string.h:432 [inline]
     [<00000000dfdc5d2d>] sctp_process_init+0xa7e/0xc20  
net/sctp/sm_make_chunk.c:2437
     [<00000000b58b62f8>] sctp_cmd_process_init net/sctp/sm_sideeffect.c:682  
[inline]
     [<00000000b58b62f8>] sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1384  
[inline]
     [<00000000b58b62f8>] sctp_side_effects net/sctp/sm_sideeffect.c:1194  
[inline]
     [<00000000b58b62f8>] sctp_do_sm+0xbdc/0x1d60  
net/sctp/sm_sideeffect.c:1165
     [<0000000044e11f96>] sctp_assoc_bh_rcv+0x13c/0x200  
net/sctp/associola.c:1074
     [<00000000ec43804d>] sctp_inq_push+0x7f/0xb0 net/sctp/inqueue.c:95
     [<00000000726aa954>] sctp_backlog_rcv+0x5e/0x2a0 net/sctp/input.c:354
     [<00000000d9e249a8>] sk_backlog_rcv include/net/sock.h:950 [inline]
     [<00000000d9e249a8>] __release_sock+0xab/0x110 net/core/sock.c:2418
     [<00000000acae44fa>] release_sock+0x37/0xd0 net/core/sock.c:2934
     [<00000000963cc9ae>] sctp_sendmsg+0x2c0/0x990 net/sctp/socket.c:2122
     [<00000000a7fc7565>] inet_sendmsg+0x64/0x120 net/ipv4/af_inet.c:802
     [<00000000b732cbd3>] sock_sendmsg_nosec net/socket.c:652 [inline]
     [<00000000b732cbd3>] sock_sendmsg+0x54/0x70 net/socket.c:671
     [<00000000274c57ab>] ___sys_sendmsg+0x393/0x3c0 net/socket.c:2292
     [<000000008252aedb>] __sys_sendmsg+0x80/0xf0 net/socket.c:2330
     [<00000000f7bf23d1>] __do_sys_sendmsg net/socket.c:2339 [inline]
     [<00000000f7bf23d1>] __se_sys_sendmsg net/socket.c:2337 [inline]
     [<00000000f7bf23d1>] __x64_sys_sendmsg+0x23/0x30 net/socket.c:2337
     [<00000000a8b4131f>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301

BUG: memory leak
unreferenced object 0xffff88810ef68400 (size 1024):
   comm "syz-executor273", pid 7046, jiffies 4294945598 (age 28.840s)
   hex dump (first 32 bytes):
     1d de 28 8d de 0b 1b e3 b5 c2 f9 68 fd 1a 97 25  ..(........h...%
     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
   backtrace:
     [<00000000a02cebbd>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:55 [inline]
     [<00000000a02cebbd>] slab_post_alloc_hook mm/slab.h:439 [inline]
     [<00000000a02cebbd>] slab_alloc mm/slab.c:3326 [inline]
     [<00000000a02cebbd>] __do_kmalloc mm/slab.c:3658 [inline]
     [<00000000a02cebbd>] __kmalloc_track_caller+0x15d/0x2c0 mm/slab.c:3675
     [<000000009e6245e6>] kmemdup+0x27/0x60 mm/util.c:119
     [<00000000dfdc5d2d>] kmemdup include/linux/string.h:432 [inline]
     [<00000000dfdc5d2d>] sctp_process_init+0xa7e/0xc20  
net/sctp/sm_make_chunk.c:2437
     [<00000000b58b62f8>] sctp_cmd_process_init net/sctp/sm_sideeffect.c:682  
[inline]
     [<00000000b58b62f8>] sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1384  
[inline]
     [<00000000b58b62f8>] sctp_side_effects net/sctp/sm_sideeffect.c:1194  
[inline]
     [<00000000b58b62f8>] sctp_do_sm+0xbdc/0x1d60  
net/sctp/sm_sideeffect.c:1165
     [<0000000044e11f96>] sctp_assoc_bh_rcv+0x13c/0x200  
net/sctp/associola.c:1074
     [<00000000ec43804d>] sctp_inq_push+0x7f/0xb0 net/sctp/inqueue.c:95
     [<00000000726aa954>] sctp_backlog_rcv+0x5e/0x2a0 net/sctp/input.c:354
     [<00000000d9e249a8>] sk_backlog_rcv include/net/sock.h:950 [inline]
     [<00000000d9e249a8>] __release_sock+0xab/0x110 net/core/sock.c:2418
     [<00000000acae44fa>] release_sock+0x37/0xd0 net/core/sock.c:2934
     [<00000000963cc9ae>] sctp_sendmsg+0x2c0/0x990 net/sctp/socket.c:2122
     [<00000000a7fc7565>] inet_sendmsg+0x64/0x120 net/ipv4/af_inet.c:802
     [<00000000b732cbd3>] sock_sendmsg_nosec net/socket.c:652 [inline]
     [<00000000b732cbd3>] sock_sendmsg+0x54/0x70 net/socket.c:671
     [<00000000274c57ab>] ___sys_sendmsg+0x393/0x3c0 net/socket.c:2292
     [<000000008252aedb>] __sys_sendmsg+0x80/0xf0 net/socket.c:2330
     [<00000000f7bf23d1>] __do_sys_sendmsg net/socket.c:2339 [inline]
     [<00000000f7bf23d1>] __se_sys_sendmsg net/socket.c:2337 [inline]
     [<00000000f7bf23d1>] __x64_sys_sendmsg+0x23/0x30 net/socket.c:2337
     [<00000000a8b4131f>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301

BUG: memory leak
unreferenced object 0xffff88810ef68400 (size 1024):
   comm "syz-executor273", pid 7046, jiffies 4294945598 (age 28.910s)
   hex dump (first 32 bytes):
     1d de 28 8d de 0b 1b e3 b5 c2 f9 68 fd 1a 97 25  ..(........h...%
     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
   backtrace:
     [<00000000a02cebbd>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:55 [inline]
     [<00000000a02cebbd>] slab_post_alloc_hook mm/slab.h:439 [inline]
     [<00000000a02cebbd>] slab_alloc mm/slab.c:3326 [inline]
     [<00000000a02cebbd>] __do_kmalloc mm/slab.c:3658 [inline]
     [<00000000a02cebbd>] __kmalloc_track_caller+0x15d/0x2c0 mm/slab.c:3675
     [<000000009e6245e6>] kmemdup+0x27/0x60 mm/util.c:119
     [<00000000dfdc5d2d>] kmemdup include/linux/string.h:432 [inline]
     [<00000000dfdc5d2d>] sctp_process_init+0xa7e/0xc20  
net/sctp/sm_make_chunk.c:2437
     [<00000000b58b62f8>] sctp_cmd_process_init net/sctp/sm_sideeffect.c:682  
[inline]
     [<00000000b58b62f8>] sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1384  
[inline]
     [<00000000b58b62f8>] sctp_side_effects net/sctp/sm_sideeffect.c:1194  
[inline]
     [<00000000b58b62f8>] sctp_do_sm+0xbdc/0x1d60  
net/sctp/sm_sideeffect.c:1165
     [<0000000044e11f96>] sctp_assoc_bh_rcv+0x13c/0x200  
net/sctp/associola.c:1074
     [<00000000ec43804d>] sctp_inq_push+0x7f/0xb0 net/sctp/inqueue.c:95
     [<00000000726aa954>] sctp_backlog_rcv+0x5e/0x2a0 net/sctp/input.c:354
     [<00000000d9e249a8>] sk_backlog_rcv include/net/sock.h:950 [inline]
     [<00000000d9e249a8>] __release_sock+0xab/0x110 net/core/sock.c:2418
     [<00000000acae44fa>] release_sock+0x37/0xd0 net/core/sock.c:2934
     [<00000000963cc9ae>] sctp_sendmsg+0x2c0/0x990 net/sctp/socket.c:2122
     [<00000000a7fc7565>] inet_sendmsg+0x64/0x120 net/ipv4/af_inet.c:802
     [<00000000b732cbd3>] sock_sendmsg_nosec net/socket.c:652 [inline]
     [<00000000b732cbd3>] sock_sendmsg+0x54/0x70 net/socket.c:671
     [<00000000274c57ab>] ___sys_sendmsg+0x393/0x3c0 net/socket.c:2292
     [<000000008252aedb>] __sys_sendmsg+0x80/0xf0 net/socket.c:2330
     [<00000000f7bf23d1>] __do_sys_sendmsg net/socket.c:2339 [inline]
     [<00000000f7bf23d1>] __se_sys_sendmsg net/socket.c:2337 [inline]
     [<00000000f7bf23d1>] __x64_sys_sendmsg+0x23/0x30 net/socket.c:2337
     [<00000000a8b4131f>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301

BUG: memory leak
unreferenced object 0xffff88810ef68400 (size 1024):
   comm "syz-executor273", pid 7046, jiffies 4294945598 (age 28.980s)
   hex dump (first 32 bytes):
     1d de 28 8d de 0b 1b e3 b5 c2 f9 68 fd 1a 97 25  ..(........h...%
     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
   backtrace:
     [<00000000a02cebbd>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:55 [inline]
     [<00000000a02cebbd>] slab_post_alloc_hook mm/slab.h:439 [inline]
     [<00000000a02cebbd>] slab_alloc mm/slab.c:3326 [inline]
     [<00000000a02cebbd>] __do_kmalloc mm/slab.c:3658 [inline]
     [<00000000a02cebbd>] __kmalloc_track_caller+0x15d/0x2c0 mm/slab.c:3675
     [<000000009e6245e6>] kmemdup+0x27/0x60 mm/util.c:119
     [<00000000dfdc5d2d>] kmemdup include/linux/string.h:432 [inline]
     [<00000000dfdc5d2d>] sctp_process_init+0xa7e/0xc20  
net/sctp/sm_make_chunk.c:2437
     [<00000000b58b62f8>] sctp_cmd_process_init net/sctp/sm_sideeffect.c:682  
[inline]
     [<00000000b58b62f8>] sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1384  
[inline]
     [<00000000b58b62f8>] sctp_side_effects net/sctp/sm_sideeffect.c:1194  
[inline]
     [<00000000b58b62f8>] sctp_do_sm+0xbdc/0x1d60  
net/sctp/sm_sideeffect.c:1165
     [<0000000044e11f96>] sctp_assoc_bh_rcv+0x13c/0x200  
net/sctp/associola.c:1074
     [<00000000ec43804d>] sctp_inq_push+0x7f/0xb0 net/sctp/inqueue.c:95
     [<00000000726aa954>] sctp_backlog_rcv+0x5e/0x2a0 net/sctp/input.c:354
     [<00000000d9e249a8>] sk_backlog_rcv include/net/sock.h:950 [inline]
     [<00000000d9e249a8>] __release_sock+0xab/0x110 net/core/sock.c:2418
     [<00000000acae44fa>] release_sock+0x37/0xd0 net/core/sock.c:2934
     [<00000000963cc9ae>] sctp_sendmsg+0x2c0/0x990 net/sctp/socket.c:2122
     [<00000000a7fc7565>] inet_sendmsg+0x64/0x120 net/ipv4/af_inet.c:802
     [<00000000b732cbd3>] sock_sendmsg_nosec net/socket.c:652 [inline]
     [<00000000b732cbd3>] sock_sendmsg+0x54/0x70 net/socket.c:671
     [<00000000274c57ab>] ___sys_sendmsg+0x393/0x3c0 net/socket.c:2292
     [<000000008252aedb>] __sys_sendmsg+0x80/0xf0 net/socket.c:2330
     [<00000000f7bf23d1>] __do_sys_sendmsg net/socket.c:2339 [inline]
     [<00000000f7bf23d1>] __se_sys_sendmsg net/socket.c:2337 [inline]
     [<00000000f7bf23d1>] __x64_sys_sendmsg+0x23/0x30 net/socket.c:2337
     [<00000000a8b4131f>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301

BUG: memory leak
unreferenced object 0xffff88810ef68400 (size 1024):
   comm "syz-executor273", pid 7046, jiffies 4294945598 (age 29.050s)
   hex dump (first 32 bytes):
     1d de 28 8d de 0b 1b e3 b5 c2 f9 68 fd 1a 97 25  ..(........h...%
     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
   backtrace:
     [<00000000a02cebbd>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:55 [inline]
     [<00000000a02cebbd>] slab_post_alloc_hook mm/slab.h:439 [inline]
     [<00000000a02cebbd>] slab_alloc mm/slab.c:3326 [inline]
     [<00000000a02cebbd>] __do_kmalloc mm/slab.c:3658 [inline]
     [<00000000a02cebbd>] __kmalloc_track_caller+0x15d/0x2c0 mm/slab.c:3675
     [<000000009e6245e6>] kmemdup+0x27/0x60 mm/util.c:119
     [<00000000dfdc5d2d>] kmemdup include/linux/string.h:432 [inline]
     [<00000000dfdc5d2d>] sctp_process_init+0xa7e/0xc20  
net/sctp/sm_make_chunk.c:2437
     [<00000000b58b62f8>] sctp_cmd_process_init net/sctp/sm_sideeffect.c:682  
[inline]
     [<00000000b58b62f8>] sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1384  
[inline]
     [<00000000b58b62f8>] sctp_side_effects net/sctp/sm_sideeffect.c:1194  
[inline]
     [<00000000b58b62f8>] sctp_do_sm+0xbdc/0x1d60  
net/sctp/sm_sideeffect.c:1165
     [<0000000044e11f96>] sctp_assoc_bh_rcv+0x13c/0x200  
net/sctp/associola.c:1074
     [<00000000ec43804d>] sctp_inq_push+0x7f/0xb0 net/sctp/inqueue.c:95
     [<00000000726aa954>] sctp_backlog_rcv+0x5e/0x2a0 net/sctp/input.c:354
     [<00000000d9e249a8>] sk_backlog_rcv include/net/sock.h:950 [inline]
     [<00000000d9e249a8>] __release_sock+0xab/0x110 net/core/sock.c:2418
     [<00000000acae44fa>] release_sock+0x37/0xd0 net/core/sock.c:2934
     [<00000000963cc9ae>] sctp_sendmsg+0x2c0/0x990 net/sctp/socket.c:2122
     [<00000000a7fc7565>] inet_sendmsg+0x64/0x120 net/ipv4/af_inet.c:802
     [<00000000b732cbd3>] sock_sendmsg_nosec net/socket.c:652 [inline]
     [<00000000b732cbd3>] sock_sendmsg+0x54/0x70 net/socket.c:671
     [<00000000274c57ab>] ___sys_sendmsg+0x393/0x3c0 net/socket.c:2292
     [<000000008252aedb>] __sys_sendmsg+0x80/0xf0 net/socket.c:2330
     [<00000000f7bf23d1>] __do_sys_sendmsg net/socket.c:2339 [inline]
     [<00000000f7bf23d1>] __se_sys_sendmsg net/socket.c:2337 [inline]
     [<00000000f7bf23d1>] __x64_sys_sendmsg+0x23/0x30 net/socket.c:2337
     [<00000000a8b4131f>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301

BUG: memory leak
unreferenced object 0xffff88810ef68400 (size 1024):
   comm "syz-executor273", pid 7046, jiffies 4294945598 (age 29.120s)
   hex dump (first 32 bytes):
     1d de 28 8d de 0b 1b e3 b5 c2 f9 68 fd 1a 97 25  ..(........h...%
     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
   backtrace:
     [<00000000a02cebbd>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:55 [inline]
     [<00000000a02cebbd>] slab_post_alloc_hook mm/slab.h:439 [inline]
     [<00000000a02cebbd>] slab_alloc mm/slab.c:3326 [inline]
     [<00000000a02cebbd>] __do_kmalloc mm/slab.c:3658 [inline]
     [<00000000a02cebbd>] __kmalloc_track_caller+0x15d/0x2c0 mm/slab.c:3675
     [<000000009e6245e6>] kmemdup+0x27/0x60 mm/util.c:119
     [<00000000dfdc5d2d>] kmemdup include/linux/string.h:432 [inline]
     [<00000000dfdc5d2d>] sctp_process_init+0xa7e/0xc20  
net/sctp/sm_make_chunk.c:2437
     [<00000000b58b62f8>] sctp_cmd_process_init net/sctp/sm_sideeffect.c:682  
[inline]
     [<00000000b58b62f8>] sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1384  
[inline]
     [<00000000b58b62f8>] sctp_side_effects net/sctp/sm_sideeffect.c:1194  
[inline]
     [<00000000b58b62f8>] sctp_do_sm+0xbdc/0x1d60  
net/sctp/sm_sideeffect.c:1165
     [<0000000044e11f96>] sctp_assoc_bh_rcv+0x13c/0x200  
net/sctp/associola.c:1074
     [<00000000ec43804d>] sctp_inq_push+0x7f/0xb0 net/sctp/inqueue.c:95
     [<00000000726aa954>] sctp_backlog_rcv+0x5e/0x2a0 net/sctp/input.c:354
     [<00000000d9e249a8>] sk_backlog_rcv include/net/sock.h:950 [inline]
     [<00000000d9e249a8>] __release_sock+0xab/0x110 net/core/sock.c:2418
     [<00000000acae44fa>] release_sock+0x37/0xd0 net/core/sock.c:2934
     [<00000000963cc9ae>] sctp_sendmsg+0x2c0/0x990 net/sctp/socket.c:2122
     [<00000000a7fc7565>] inet_sendmsg+0x64/0x120 net/ipv4/af_inet.c:802
     [<00000000b732cbd3>] sock_sendmsg_nosec net/socket.c:652 [inline]
     [<00000000b732cbd3>] sock_sendmsg+0x54/0x70 net/socket.c:671
     [<00000000274c57ab>] ___sys_sendmsg+0x393/0x3c0 net/socket.c:2292
     [<000000008252aedb>] __sys_sendmsg+0x80/0xf0 net/socket.c:2330
     [<00000000f7bf23d1>] __do_sys_sendmsg net/socket.c:2339 [inline]
     [<00000000f7bf23d1>] __se_sys_sendmsg net/socket.c:2337 [inline]
     [<00000000f7bf23d1>] __x64_sys_sendmsg+0x23/0x30 net/socket.c:2337
     [<00000000a8b4131f>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301

BUG: memory leak
unreferenced object 0xffff88810ef68400 (size 1024):
   comm "syz-executor273", pid 7046, jiffies 4294945598 (age 29.190s)
   hex dump (first 32 bytes):
     1d de 28 8d de 0b 1b e3 b5 c2 f9 68 fd 1a 97 25  ..(........h...%
     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
   backtrace:
     [<00000000a02cebbd>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:55 [inline]
     [<00000000a02cebbd>] slab_post_alloc_hook mm/slab.h:439 [inline]
     [<00000000a02cebbd>] slab_alloc mm/slab.c:3326 [inline]
     [<00000000a02cebbd>] __do_kmalloc mm/slab.c:3658 [inline]
     [<00000000a02cebbd>] __kmalloc_track_caller+0x15d/0x2c0 mm/slab.c:3675
     [<000000009e6245e6>] kmemdup+0x27/0x60 mm/util.c:119
     [<00000000dfdc5d2d>] kmemdup include/linux/string.h:432 [inline]
     [<00000000dfdc5d2d>] sctp_process_init+0xa7e/0xc20  
net/sctp/sm_make_chunk.c:2437
     [<00000000b58b62f8>] sctp_cmd_process_init net/sctp/sm_sideeffect.c:682  
[inline]
     [<00000000b58b62f8>] sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1384  
[inline]
     [<00000000b58b62f8>] sctp_side_effects net/sctp/sm_sideeffect.c:1194  
[inline]
     [<00000000b58b62f8>] sctp_do_sm+0xbdc/0x1d60  
net/sctp/sm_sideeffect.c:1165
     [<0000000044e11f96>] sctp_assoc_bh_rcv+0x13c/0x200  
net/sctp/associola.c:1074
     [<00000000ec43804d>] sctp_inq_push+0x7f/0xb0 net/sctp/inqueue.c:95
     [<00000000726aa954>] sctp_backlog_rcv+0x5e/0x2a0 net/sctp/input.c:354
     [<00000000d9e249a8>] sk_backlog_rcv include/net/sock.h:950 [inline]
     [<00000000d9e249a8>] __release_sock+0xab/0x110 net/core/sock.c:2418
     [<00000000acae44fa>] release_sock+0x37/0xd0 net/core/sock.c:2934
     [<00000000963cc9ae>] sctp_sendmsg+0x2c0/0x990 net/sctp/socket.c:2122
     [<00000000a7fc7565>] inet_sendmsg+0x64/0x120 net/ipv4/af_inet.c:802
     [<00000000b732cbd3>] sock_sendmsg_nosec net/socket.c:652 [inline]
     [<00000000b732cbd3>] sock_sendmsg+0x54/0x70 net/socket.c:671
     [<00000000274c57ab>] ___sys_sendmsg+0x393/0x3c0 net/socket.c:2292
     [<000000008252aedb>] __sys_sendmsg+0x80/0xf0 net/socket.c:2330
     [<00000000f7bf23d1>] __do_sys_sendmsg net/socket.c:2339 [inline]
     [<00000000f7bf23d1>] __se_sys_sendmsg net/socket.c:2337 [inline]
     [<00000000f7bf23d1>] __x64_sys_sendmsg+0x23/0x30 net/socket.c:2337
     [<00000000a8b4131f>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301

BUG: memory leak
unreferenced object 0xffff88810ef68400 (size 1024):
   comm "syz-executor273", pid 7046, jiffies 4294945598 (age 29.260s)
   hex dump (first 32 bytes):
     1d de 28 8d de 0b 1b e3 b5 c2 f9 68 fd 1a 97 25  ..(........h...%
     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
   backtrace:
     [<00000000a02cebbd>] kmemleak_alloc_recursive  
include/linux/kmemleak.h:55 [inline]
     [<00000000a02cebbd>] slab_post_alloc_hook mm/slab.h:439 [inline]
     [<00000000a02cebbd>] slab_alloc mm/slab.c:3326 [inline]
     [<00000000a02cebbd>] __do_kmalloc mm/slab.c:3658 [inline]
     [<00000000a02cebbd>] __kmalloc_track_caller+0x15d/0x2c0 mm/slab.c:3675
     [<000000009e6245e6>] kmemdup+0x27/0x60 mm/util.c:119
     [<00000000dfdc5d2d>] kmemdup include/linux/string.h:432 [inline]
     [<00000000dfdc5d2d>] sctp_process_init+0xa7e/0xc20  
net/sctp/sm_make_chunk.c:2437
     [<00000000b58b62f8>] sctp_cmd_process_init net/sctp/sm_sideeffect.c:682  
[inline]
     [<00000000b58b62f8>] sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1384  
[inline]
     [<00000000b58b62f8>] sctp_side_effects net/sctp/sm_sideeffect.c:1194  
[inline]
     [<00000000b58b62f8>] sctp_do_sm+0xbdc/0x1d60  
net/sctp/sm_sideeffect.c:1165
     [<0000000044e11f96>] sctp_assoc_bh_rcv+0x13c/0x200  
net/sctp/associola.c:1074
     [<00000000ec43804d>] sctp_inq_push+0x7f/0xb0 net/sctp/inqueue.c:95
     [<00000000726aa954>] sctp_backlog_rcv+0x5e/0x2a0 net/sctp/input.c:354
     [<00000000d9e249a8>] sk_backlog_rcv include/net/sock.h:950 [inline]
     [<00000000d9e249a8>] __release_sock+0xab/0x110 net/core/sock.c:2418
     [<00000000acae44fa>] release_sock+0x37/0xd0 net/core/sock.c:2934
     [<00000000963cc9ae>] sctp_sendmsg+0x2c0/0x990 net/sctp/socket.c:2122
     [<00000000a7fc7565>] inet_sendmsg+0x64/0x120 net/ipv4/af_inet.c:802
     [<00000000b732cbd3>] sock_sendmsg_nosec net/socket.c:652 [inline]
     [<00000000b732cbd3>] sock_sendmsg+0x54/0x70 net/socket.c:671
     [<00000000274c57ab>] ___sys_sendmsg+0x393/0x3c0 net/socket.c:2292
     [<000000008252aedb>] __sys_sendmsg+0x80/0xf0 net/socket.c:2330
     [<00000000f7bf23d1>] __do_sys_sendmsg net/socket.c:2339 [inline]
     [<00000000f7bf23d1>] __se_sys_sendmsg net/socket.c:2337 [inline]
     [<00000000f7bf23d1>] __x64_sys_sendmsg+0x23/0x30 net/socket.c:2337
     [<00000000a8b4131f>] do_syscall_64+0x76/0x1a0  
arch/x86/entry/common.c:301

---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at [email-masked].

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches