[syzbot] [jfs?] KASAN: null-ptr-deref Read in txBegin

[syzbot] [jfs?] KASAN: null-ptr-deref Read in txBegin

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    82eac0c830b7 Merge tag 'for-linus' of git://git.kernel.org..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=108c3220c80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=42ba4da8e1e6af9f
dashboard link: https://syzkaller.appspot.com/bug?extid=f1faa20eec55e0c8644c
compiler:       Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12dea55f480000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/da7d342f68c6/disk-82eac0c8.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/bc04dc7d5c40/vmlinux-82eac0c8.xz
kernel image: https://storage.googleapis.com/syzbot-assets/9cbbc3b0e69a/bzImage-82eac0c8.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/40deef8f8496/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f1faa20eec55e0c8644c@syzkaller.appspotmail.com

read_mapping_page failed!
ERROR: (device loop0): txCommit: 
==================================================================
BUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:72 [inline]
BUG: KASAN: null-ptr-deref in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
BUG: KASAN: null-ptr-deref in txBegin+0x131/0x6c0 fs/jfs/jfs_txnmgr.c:366
Read of size 8 at addr 0000000000000040 by task syz-executor.0/5172

CPU: 0 PID: 5172 Comm: syz-executor.0 Not tainted 6.2.0-rc8-syzkaller-00019-g82eac0c830b7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 print_report+0xe6/0x4f0 mm/kasan/report.c:420
 kasan_report+0x13a/0x170 mm/kasan/report.c:517
 kasan_check_range+0x283/0x290 mm/kasan/generic.c:189
 instrument_atomic_read include/linux/instrumented.h:72 [inline]
 _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
 txBegin+0x131/0x6c0 fs/jfs/jfs_txnmgr.c:366
 jfs_link+0x1ac/0x5e0 fs/jfs/namei.c:802
 vfs_link+0x662/0x810 fs/namei.c:4529
 do_linkat+0x5b4/0x9d0 fs/namei.c:4600
 __do_sys_linkat fs/namei.c:4628 [inline]
 __se_sys_linkat fs/namei.c:4625 [inline]
 __x64_sys_linkat+0xdd/0xf0 fs/namei.c:4625
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7ff38288c0f9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff383575168 EFLAGS: 00000246 ORIG_RAX: 0000000000000109
RAX: ffffffffffffffda RBX: 00007ff3829abf80 RCX: 00007ff38288c0f9
RDX: 0000000000000004 RSI: 0000000020000040 RDI: 0000000000000004
RBP: 00007ff3828e7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000080 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe4ad3d6bf R14: 00007ff383575300 R15: 0000000000022000
 </TASK>
==================================================================


---
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Re: [syzbot] [jfs?] KASAN: null-ptr-deref Read in txBegin

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit:    14f8db1c0f9a Merge branch 'for-next/core' into for-kernelci
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=12f5764e280000
kernel config:  https://syzkaller.appspot.com/x/.config?x=a837a8ba7e88bb45
dashboard link: https://syzkaller.appspot.com/bug?extid=f1faa20eec55e0c8644c
compiler:       Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: arm64
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15b9e24e280000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=105d3e46280000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/ad6ce516eed3/disk-14f8db1c.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/1f38c2cc7667/vmlinux-14f8db1c.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d795115eee39/Image-14f8db1c.gz.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/014681b264cc/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f1faa20eec55e0c8644c@syzkaller.appspotmail.com

WARNING: The mand mount option has been deprecated and
         and is ignored by this kernel. Remove the mand
         option from the mount to silence this warning.
=======================================================
Unable to handle kernel paging request at virtual address dfff800000000008
KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047]
Mem abort info:
  ESR = 0x0000000096000006
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x06: level 2 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000006
  CM = 0, WnR = 0
[dfff800000000008] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 5926 Comm: syz-executor228 Not tainted 6.3.0-rc7-syzkaller-g14f8db1c0f9a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : generic_test_bit include/asm-generic/bitops/generic-non-atomic.h:128 [inline]
pc : txBegin+0x138/0x5e0 fs/jfs/jfs_txnmgr.c:366
lr : txBegin+0x104/0x5e0 fs/jfs/jfs_txnmgr.c:357
sp : ffff80001eb37660
x29: ffff80001eb37680 x28: dfff800000000000 x27: dfff800000000000
x26: ffff800016308bc8 x25: 0000000000000040 x24: 0000000000000000
x23: ffff800016306520 x22: ffff0000d6a57c30 x21: 0000000000000150
x20: 0000000000000008 x19: 0000000000000000 x18: ffff80001eb37360
x17: ffff800008ad82e4 x16: ffff80000831ae40 x15: 000000000000bb8c
x14: 000000003eb35159 x13: dfff800000000000 x12: ffff700003d66eb4
x11: 0000000000000001 x10: 0000000000000000 x9 : 0000000000000000
x8 : 1ffff00002c5f670 x7 : 0000000000000000 x6 : 0000000000000000
x5 : ffff800019238f80 x4 : 0000000000000008 x3 : ffff80000831af70
x2 : 0000000000000001 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 txBegin+0x138/0x5e0 fs/jfs/jfs_txnmgr.c:362
 __jfs_xattr_set+0xc8/0x190 fs/jfs/xattr.c:915
 jfs_xattr_set+0x58/0x70 fs/jfs/xattr.c:941
 __vfs_setxattr+0x3d8/0x400 fs/xattr.c:203
 __vfs_setxattr_noperm+0x110/0x528 fs/xattr.c:237
 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:298
 vfs_setxattr+0x1a8/0x344 fs/xattr.c:324
 do_setxattr fs/xattr.c:609 [inline]
 setxattr+0x208/0x29c fs/xattr.c:632
 path_setxattr+0x17c/0x258 fs/xattr.c:651
 __do_sys_setxattr fs/xattr.c:667 [inline]
 __se_sys_setxattr fs/xattr.c:663 [inline]
 __arm64_sys_setxattr+0xbc/0xd8 fs/xattr.c:663
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:193
 el0_svc+0x4c/0x15c arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591
Code: 9400012e aa1703e0 95954bf6 350002f8 (387c6a88) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	9400012e 	bl	0x4b8
   4:	aa1703e0 	mov	x0, x23
   8:	95954bf6 	bl	0x6552fe0
   c:	350002f8 	cbnz	w24, 0x68
* 10:	387c6a88 	ldrb	w8, [x20, x28] <-- trapping instruction


---
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