general protection fault in rb_erase

Tue Sep 25 23:44:03 UTC 2018

Hello,

syzbot found the following crash on:

HEAD commit:    846e8dd47c26 Merge tag 'scsi-fixes' of git://git.kernel.or..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15c874a1400000
kernel config:  https://syzkaller.appspot.com/x/.config?x=dfb440e26f0a6f6f
dashboard link: https://syzkaller.appspot.com/bug?extid=e81ccd4744c6c4f71354
compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15bddd2a400000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1293d3fa400000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+e81ccd4744c6c4f71354 at syzkaller.appspotmail.com

kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 5336 Comm: syz-executor564 Not tainted 4.19.0-rc5+ #31
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
RIP: 0010:__rb_erase_augmented include/linux/rbtree_augmented.h:168 [inline]
RIP: 0010:rb_erase+0x306/0x3710 lib/rbtree.c:459
Code: c7 81 28 01 00 00 f2 f2 f2 f2 c7 81 2c 01 00 00 00 f2 f2 f2 48 89 f9  
65 48 8b 1c 25 28 00 00 00 48 89 5d d0 31 db 48 c1 e9 03 <42> 80 3c 01 00  
0f 85 41 1c 00 00 4c 8d 48 10 4c 8b 78 08 48 b9 00
RSP: 0018:ffff8801d782e918 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 1ffff1003af05d2b RSI: ffffffff8b5a08a0 RDI: 0000000000000008
RBP: ffff8801d782f320 R08: dffffc0000000000 R09: fffffbfff135d5c8
R10: fffffbfff135d5c8 R11: ffffffff89aeae43 R12: ffff8801b677f1f0
R13: dffffc0000000000 R14: ffff8801d782f2f8 R15: ffff8801d782f438
FS:  0000000002278880(0000) GS:ffff8801dac00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000700 CR3: 00000001d84b2000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  integrity_inode_free+0x12f/0x320 security/integrity/iint.c:150
  security_inode_free+0x19/0x90 security/security.c:453
  __destroy_inode+0x328/0x820 fs/inode.c:238
  destroy_inode+0xda/0x200 fs/inode.c:265
  evict+0x5e0/0x980 fs/inode.c:575
  iput_final fs/inode.c:1547 [inline]
  iput+0x679/0xa90 fs/inode.c:1573
  swap_inode_boot_loader fs/ext4/ioctl.c:188 [inline]
  ext4_ioctl+0x236f/0x4210 fs/ext4/ioctl.c:865
  vfs_ioctl fs/ioctl.c:46 [inline]
  file_ioctl fs/ioctl.c:501 [inline]
  do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:685
  ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702
  __do_sys_ioctl fs/ioctl.c:709 [inline]
  __se_sys_ioctl fs/ioctl.c:707 [inline]
  __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707
  do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x440029
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffdcb8f20d8 EFLAGS: 00000217 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440029
RDX: 0000000000440029 RSI: 0000000000006611 RDI: 0000000000000004
RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004018b0
R13: 0000000000401940 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace 07a7abe879deb9f2 ]---
RIP: 0010:__rb_erase_augmented include/linux/rbtree_augmented.h:168 [inline]
RIP: 0010:rb_erase+0x306/0x3710 lib/rbtree.c:459
Code: c7 81 28 01 00 00 f2 f2 f2 f2 c7 81 2c 01 00 00 00 f2 f2 f2 48 89 f9  
65 48 8b 1c 25 28 00 00 00 48 89 5d d0 31 db 48 c1 e9 03 <42> 80 3c 01 00  
0f 85 41 1c 00 00 4c 8d 48 10 4c 8b 78 08 48 b9 00
RSP: 0018:ffff8801d782e918 EFLAGS: 00010202
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 1ffff1003af05d2b RSI: ffffffff8b5a08a0 RDI: 0000000000000008
RBP: ffff8801d782f320 R08: dffffc0000000000 R09: fffffbfff135d5c8
R10: fffffbfff135d5c8 R11: ffffffff89aeae43 R12: ffff8801b677f1f0
R13: dffffc0000000000 R14: ffff8801d782f2f8 R15: ffff8801d782f438
FS:  0000000002278880(0000) GS:ffff8801dac00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000700 CR3: 00000001d84b2000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

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