Subject: Re: KASAN: invalid-free in rsi_91x_deinit

From: Johan Hovold <[email-masked]>
Date: Thu, 28 Nov 2019 18:07:02 +0100

On Tue, Nov 19, 2019 at 02:38:11PM +0100, Andrey Konovalov wrote:
> On Tue, Apr 23, 2019 at 2:36 PM syzbot
> <[email-masked]> wrote:
> >
> > Hello,
> >
> > syzbot found the following crash on:
> >
> > HEAD commit:    d34f9519 usb-fuzzer: main usb gadget fuzzer driver
> > git tree:       https://github.com/google/kasan/tree/usb-fuzzer
> > console output: https://syzkaller.appspot.com/x/log.txt?x=14a79403200000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=c73d1bb5aeaeae20
> > dashboard link: https://syzkaller.appspot.com/bug?extid=7c72edfb407b2bd866ce
> > compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17547247200000
> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=147b3a1d200000
> >
> > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > Reported-by: [email-masked]
> >
> > usb 1-1: config 252 interface 115 altsetting 0 has 1 endpoint descriptor,
> > different from the interface descriptor's value: 4
> > usb 1-1: New USB device found, idVendor=1618, idProduct=9113,
> > bcdDevice=32.21
> > usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
> > rsi_91x: rsi_probe: Failed to init usb interface
> > ==================================================================
> > BUG: KASAN: double-free or invalid-free in slab_free mm/slub.c:3003 [inline]
> > BUG: KASAN: double-free or invalid-free in kfree+0xce/0x280 mm/slub.c:3958
> >
> > CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.1.0-rc5-319617-gd34f951 #4
> > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> > Google 01/01/2011
> > Workqueue: usb_hub_wq hub_event
> > Call Trace:
> >   __dump_stack lib/dump_stack.c:77 [inline]
> >   dump_stack+0xe8/0x16e lib/dump_stack.c:113
> >   print_address_description+0x6c/0x236 mm/kasan/report.c:187
> >   kasan_report_invalid_free+0x66/0xa0 mm/kasan/report.c:278
> >   __kasan_slab_free+0x162/0x180 mm/kasan/common.c:438
> >   slab_free_hook mm/slub.c:1429 [inline]
> >   slab_free_freelist_hook+0x5e/0x140 mm/slub.c:1456
> >   slab_free mm/slub.c:3003 [inline]
> >   kfree+0xce/0x280 mm/slub.c:3958
> >   rsi_91x_deinit+0x27b/0x300 drivers/net/wireless/rsi/rsi_91x_main.c:407
> >   rsi_probe+0xdf3/0x140d drivers/net/wireless/rsi/rsi_91x_sdio.c:1178
> >   usb_probe_interface+0x31d/0x820 drivers/usb/core/driver.c:361
> >   really_probe+0x2da/0xb10 drivers/base/dd.c:509
> >   driver_probe_device+0x21d/0x350 drivers/base/dd.c:671
> >   __device_attach_driver+0x1d8/0x290 drivers/base/dd.c:778
> >   bus_for_each_drv+0x163/0x1e0 drivers/base/bus.c:454
> >   __device_attach+0x223/0x3a0 drivers/base/dd.c:844
> >   bus_probe_device+0x1f1/0x2a0 drivers/base/bus.c:514
> >   device_add+0xad2/0x16e0 drivers/base/core.c:2106
> >   usb_set_configuration+0xdf7/0x1740 drivers/usb/core/message.c:2021
> >   generic_probe+0xa2/0xda drivers/usb/core/generic.c:210
> >   usb_probe_device+0xc0/0x150 drivers/usb/core/driver.c:266
> >   really_probe+0x2da/0xb10 drivers/base/dd.c:509
> >   driver_probe_device+0x21d/0x350 drivers/base/dd.c:671
> >   __device_attach_driver+0x1d8/0x290 drivers/base/dd.c:778
> >   bus_for_each_drv+0x163/0x1e0 drivers/base/bus.c:454
> >   __device_attach+0x223/0x3a0 drivers/base/dd.c:844
> >   bus_probe_device+0x1f1/0x2a0 drivers/base/bus.c:514
> >   device_add+0xad2/0x16e0 drivers/base/core.c:2106
> >   usb_new_device.cold+0x537/0xccf drivers/usb/core/hub.c:2534
> >   hub_port_connect drivers/usb/core/hub.c:5089 [inline]
> >   hub_port_connect_change drivers/usb/core/hub.c:5204 [inline]
> >   port_event drivers/usb/core/hub.c:5350 [inline]
> >   hub_event+0x1398/0x3b00 drivers/usb/core/hub.c:5432
> >   process_one_work+0x90f/0x1580 kernel/workqueue.c:2269
> >   worker_thread+0x9b/0xe20 kernel/workqueue.c:2415
> >   kthread+0x313/0x420 kernel/kthread.c:253
> >   ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
> >
> > Allocated by task 12:
> >   set_track mm/kasan/common.c:87 [inline]
> >   __kasan_kmalloc mm/kasan/common.c:497 [inline]
> >   __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:470
> >   rsi_init_sdio_interface drivers/net/wireless/rsi/rsi_91x_sdio.c:853
> > [inline]
> >   rsi_probe+0x11a/0x140d drivers/net/wireless/rsi/rsi_91x_sdio.c:965
> >   usb_probe_interface+0x31d/0x820 drivers/usb/core/driver.c:361
> >   really_probe+0x2da/0xb10 drivers/base/dd.c:509
> >   driver_probe_device+0x21d/0x350 drivers/base/dd.c:671
> >   __device_attach_driver+0x1d8/0x290 drivers/base/dd.c:778
> >   bus_for_each_drv+0x163/0x1e0 drivers/base/bus.c:454
> >   __device_attach+0x223/0x3a0 drivers/base/dd.c:844
> >   bus_probe_device+0x1f1/0x2a0 drivers/base/bus.c:514
> >   device_add+0xad2/0x16e0 drivers/base/core.c:2106
> >   usb_set_configuration+0xdf7/0x1740 drivers/usb/core/message.c:2021
> >   generic_probe+0xa2/0xda drivers/usb/core/generic.c:210
> >   usb_probe_device+0xc0/0x150 drivers/usb/core/driver.c:266
> >   really_probe+0x2da/0xb10 drivers/base/dd.c:509
> >   driver_probe_device+0x21d/0x350 drivers/base/dd.c:671
> >   __device_attach_driver+0x1d8/0x290 drivers/base/dd.c:778
> >   bus_for_each_drv+0x163/0x1e0 drivers/base/bus.c:454
> >   __device_attach+0x223/0x3a0 drivers/base/dd.c:844
> >   bus_probe_device+0x1f1/0x2a0 drivers/base/bus.c:514
> >   device_add+0xad2/0x16e0 drivers/base/core.c:2106
> >   usb_new_device.cold+0x537/0xccf drivers/usb/core/hub.c:2534
> >   hub_port_connect drivers/usb/core/hub.c:5089 [inline]
> >   hub_port_connect_change drivers/usb/core/hub.c:5204 [inline]
> >   port_event drivers/usb/core/hub.c:5350 [inline]
> >   hub_event+0x1398/0x3b00 drivers/usb/core/hub.c:5432
> >   process_one_work+0x90f/0x1580 kernel/workqueue.c:2269
> >   worker_thread+0x9b/0xe20 kernel/workqueue.c:2415
> >   kthread+0x313/0x420 kernel/kthread.c:253
> >   ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
> >
> > Freed by task 12:
> >   set_track mm/kasan/common.c:87 [inline]
> >   __kasan_slab_free+0x130/0x180 mm/kasan/common.c:459
> >   slab_free_hook mm/slub.c:1429 [inline]
> >   slab_free_freelist_hook+0x5e/0x140 mm/slub.c:1456
> >   slab_free mm/slub.c:3003 [inline]
> >   kfree+0xce/0x280 mm/slub.c:3958
> >   rsi_probe+0xf04/0x140d drivers/net/wireless/rsi/rsi_91x_sdio.c:1196
> >   usb_probe_interface+0x31d/0x820 drivers/usb/core/driver.c:361
> >   really_probe+0x2da/0xb10 drivers/base/dd.c:509
> >   driver_probe_device+0x21d/0x350 drivers/base/dd.c:671
> >   __device_attach_driver+0x1d8/0x290 drivers/base/dd.c:778
> >   bus_for_each_drv+0x163/0x1e0 drivers/base/bus.c:454
> >   __device_attach+0x223/0x3a0 drivers/base/dd.c:844
> >   bus_probe_device+0x1f1/0x2a0 drivers/base/bus.c:514
> >   device_add+0xad2/0x16e0 drivers/base/core.c:2106
> >   usb_set_configuration+0xdf7/0x1740 drivers/usb/core/message.c:2021
> >   generic_probe+0xa2/0xda drivers/usb/core/generic.c:210
> >   usb_probe_device+0xc0/0x150 drivers/usb/core/driver.c:266
> >   really_probe+0x2da/0xb10 drivers/base/dd.c:509
> >   driver_probe_device+0x21d/0x350 drivers/base/dd.c:671
> >   __device_attach_driver+0x1d8/0x290 drivers/base/dd.c:778
> >   bus_for_each_drv+0x163/0x1e0 drivers/base/bus.c:454
> >   __device_attach+0x223/0x3a0 drivers/base/dd.c:844
> >   bus_probe_device+0x1f1/0x2a0 drivers/base/bus.c:514
> >   device_add+0xad2/0x16e0 drivers/base/core.c:2106
> >   usb_new_device.cold+0x537/0xccf drivers/usb/core/hub.c:2534
> >   hub_port_connect drivers/usb/core/hub.c:5089 [inline]
> >   hub_port_connect_change drivers/usb/core/hub.c:5204 [inline]
> >   port_event drivers/usb/core/hub.c:5350 [inline]
> >   hub_event+0x1398/0x3b00 drivers/usb/core/hub.c:5432
> >   process_one_work+0x90f/0x1580 kernel/workqueue.c:2269
> >   worker_thread+0x9b/0xe20 kernel/workqueue.c:2415
> >   kthread+0x313/0x420 kernel/kthread.c:253
> >   ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
> >
> > The buggy address belongs to the object at ffff888214af0c80
> >   which belongs to the cache kmalloc-512 of size 512
> > The buggy address is located 0 bytes inside of
> >   512-byte region [ffff888214af0c80, ffff888214af0e80)
> > The buggy address belongs to the page:
> > page:ffffea000852bc00 count:1 mapcount:0 mapping:ffff88812c3f4c00
> > index:0xffff888214af1180 compound_mapcount: 0
> > flags: 0x57ff00000010200(slab|head)
> > raw: 057ff00000010200 ffffea00086b3780 0000000800000008 ffff88812c3f4c00
> > raw: ffff888214af1180 00000000800c000a 00000001ffffffff 0000000000000000
> > page dumped because: kasan: bad access detected
> >
> > Memory state around the buggy address:
> >   ffff888214af0b80: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc
> >   ffff888214af0c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> > > ffff888214af0c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> >                     ^
> >   ffff888214af0d00: fb fb fb fb fb fb f
> >
> >
> > ---
> > 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
> 
> Most likely the same issue as:
> 
> #syz dup: WARNING: ODEBUG bug in rsi_probe
> 
> https://syzkaller.appspot.com/bug?extid=1d1597a5aa3679c65b9f

No, this was separate bug that was fixed by commit 8b51dc729147 ("rsi:
fix a double free bug in rsi_91x_deinit()").

Let me try to mark it as such:

#syz undup

Johan