Re: WARNING: ODEBUG bug in rsi_probe

[Johan Hovold]

On Fri, Apr 19, 2019 at 04:54:06PM -0700, syzbot wrote:
> syzbot has found a reproducer for 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=13431e7b200000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=c73d1bb5aeaeae20
> dashboard link: https://syzkaller.appspot.com/bug?extid=1d1597a5aa3679c65b9f
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12534fdd200000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=147c9247200000
> 
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+1d1597a5aa3679c65b9f@xxxxxxxxxxxxxxxxxxxxxxxxx
> 
> rsi_91x: rsi_load_firmware: REGOUT read failed
> rsi_91x: rsi_hal_device_init: Failed to load TA instructions
> rsi_91x: rsi_probe: Failed in device init
> ------------[ cut here ]------------
> ODEBUG: free active (active state 0) object type: timer_list hint:  
> bl_cmd_timeout+0x0/0x50 drivers/net/wireless/rsi/rsi_91x_hal.c:577
> WARNING: CPU: 0 PID: 563 at lib/debugobjects.c:325  
> debug_print_object+0x162/0x250 lib/debugobjects.c:325
> Kernel panic - not syncing: panic_on_warn set ...
> CPU: 0 PID: 563 Comm: kworker/0:2 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
>   panic+0x29d/0x5f2 kernel/panic.c:214
>   __warn.cold+0x20/0x48 kernel/panic.c:571
>   report_bug+0x262/0x2a0 lib/bug.c:186
>   fixup_bug arch/x86/kernel/traps.c:179 [inline]
>   fixup_bug arch/x86/kernel/traps.c:174 [inline]
>   do_error_trap+0x130/0x1f0 arch/x86/kernel/traps.c:272
>   do_invalid_op+0x37/0x40 arch/x86/kernel/traps.c:291
>   invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973
> RIP: 0010:debug_print_object+0x162/0x250 lib/debugobjects.c:325
> Code: dd c0 a8 b3 8e 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 bf 00 00 00 48  
> 8b 14 dd c0 a8 b3 8e 48 c7 c7 40 9d b3 8e e8 8e c3 d2 fd <0f> 0b 83 05 f9  
> 0f 5a 10 01 48 83 c4 20 5b 5d 41 5c 41 5d c3 48 89
> RSP: 0018:ffff88809e1ef110 EFLAGS: 00010086
> RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000
> RDX: 0000000000000000 RSI: ffffffff815b1d22 RDI: ffffed1013c3de14
> RBP: 0000000000000001 R08: ffff88809e1cb100 R09: ffffed1015a03edb
> R10: ffffed1015a03eda R11: ffff8880ad01f6d7 R12: ffffffff917e77c0
> R13: ffffffff8161e740 R14: ffffffff96d3ea28 R15: ffff8880a5a75f60
>   __debug_check_no_obj_freed lib/debugobjects.c:785 [inline]
>   debug_check_no_obj_freed+0x2a3/0x42e lib/debugobjects.c:817
>   slab_free_hook mm/slub.c:1426 [inline]
>   slab_free_freelist_hook+0xfb/0x140 mm/slub.c:1456
>   slab_free mm/slub.c:3003 [inline]
>   kfree+0xce/0x280 mm/slub.c:3958
>   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
> 
> ======================================================

Let's try to test the below combined patch which fixes both the above
use-after-free issue and a second one which syzbot is likely to hit once
the first one is fixed.

#syz test: https://github.com/google/kasan.git master

Johan