Subject: Re: [syzbot] WARNING: kmalloc bug in hash_ip_create

From: Jozsef Kadlecsik <[email-masked]>
Date: Mon, 6 Sep 2021 18:17:08 +0200 (CEST)

Hi Pablo,

I'm going to send the patch which fixes the issue together with the other 
ones in the same bunch.

Best regards,
Jozsef

On Fri, 3 Sep 2021, syzbot wrote:

> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    a9c9a6f741cd Merge tag 'scsi-misc' of git://git.kernel.org..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=13246f25300000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=7860a0536ececf0c
> dashboard link: https://syzkaller.appspot.com/bug?extid=3493b1873fb3ea827986
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11602f35300000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10e8fbf5300000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: [email-masked]
> 
> ------------[ cut here ]------------
> WARNING: CPU: 1 PID: 8430 at mm/util.c:597 kvmalloc_node+0x111/0x120 mm/util.c:597
> Modules linked in:
> CPU: 1 PID: 8430 Comm: syz-executor792 Not tainted 5.14.0-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> RIP: 0010:kvmalloc_node+0x111/0x120 mm/util.c:597
> Code: 01 00 00 00 4c 89 e7 e8 8d 12 0d 00 49 89 c5 e9 69 ff ff ff e8 f0 21 d1 ff 41 89 ed 41 81 cd 00 20 01 00 eb 95 e8 df 21 d1 ff <0f> 0b e9 4c ff ff ff 0f 1f 84 00 00 00 00 00 55 48 89 fd 53 e8 c6
> RSP: 0018:ffffc9000108f280 EFLAGS: 00010293
> RAX: 0000000000000000 RBX: ffffc9000108f3a0 RCX: 0000000000000000
> RDX: ffff88801bfd5580 RSI: ffffffff81a4f621 RDI: 0000000000000003
> RBP: 0000000000400dc0 R08: 000000007fffffff R09: 00000000ffffffff
> R10: ffffffff81a4f5de R11: 000000000000001f R12: 0000000200000018
> R13: 0000000000000000 R14: 00000000ffffffff R15: ffff888028b41a00
> FS:  0000000002409300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000020000006 CR3: 00000000127f1000 CR4: 0000000000350ee0
> Call Trace:
>  hash_ip_create+0x4bb/0x13d0 net/netfilter/ipset/ip_set_hash_gen.h:1524
>  ip_set_create+0x782/0x15a0 net/netfilter/ipset/ip_set_core.c:1100
>  nfnetlink_rcv_msg+0xbc9/0x13f0 net/netfilter/nfnetlink.c:296
>  netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504
>  nfnetlink_rcv+0x1ac/0x420 net/netfilter/nfnetlink.c:654
>  netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
>  netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340
>  netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929
>  sock_sendmsg_nosec net/socket.c:704 [inline]
>  sock_sendmsg+0xcf/0x120 net/socket.c:724
>  ____sys_sendmsg+0x6e8/0x810 net/socket.c:2409
>  ___sys_sendmsg+0xf3/0x170 net/socket.c:2463
>  __sys_sendmsg+0xe5/0x1b0 net/socket.c:2492
>  do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>  do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>  entry_SYSCALL_64_after_hwframe+0x44/0xae
> RIP: 0033:0x43f029
> Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007ffd662e8c48 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
> RAX: ffffffffffffffda RBX: 0000000000400488 RCX: 000000000043f029
> RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000003
> RBP: 0000000000403010 R08: 0000000000000005 R09: 0000000000400488
> R10: 0000000000000001 R11: 0000000000000246 R12: 00000000004030a0
> R13: 0000000000000000 R14: 00000000004ac018 R15: 0000000000400488
> 
> 
> ---
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> 
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> 

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