[syzbot] [crypto?] [bcachefs?] BUG: unable to handle kernel paging request in crypto_shash_update

[syzbot <syzbot+e46f29a4b409be681ad9@syzkaller.appspotmail.com>]

Hello,

syzbot found the following issue on:

HEAD commit:    c912bf709078 Merge remote-tracking branches 'origin/arm64-..
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=10696b35980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=79a49b0b9ffd6585
dashboard link: https://syzkaller.appspot.com/bug?extid=e46f29a4b409be681ad9
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=117911a5980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16f0554e980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/fea69a9d153c/disk-c912bf70.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/be06762a72ef/vmlinux-c912bf70.xz
kernel image: https://storage.googleapis.com/syzbot-assets/6c8e58b4215d/Image-c912bf70.gz.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/cb5b89772c6e/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e46f29a4b409be681ad9@syzkaller.appspotmail.com

 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:131
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:150
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598
Unable to handle kernel paging request at virtual address dfff800000000004
KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027]
Mem abort info:
  ESR = 0x0000000096000005
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x05: level 1 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000
  CM = 0, WnR = 0, TnD = 0, TagAccess = 0
  GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
[dfff800000000004] address between user and kernel address ranges
Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 6452 Comm: syz-executor232 Not tainted 6.10.0-rc7-syzkaller-gc912bf709078 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : crypto_shash_alg include/crypto/hash.h:733 [inline]
pc : crypto_shash_update+0x50/0xa8 crypto/shash.c:52
lr : crypto_shash_update+0x30/0xa8 crypto/shash.c:51
sp : ffff80009ff56620
x29: ffff80009ff56620 x28: fff1000040000000 x27: ffff80009ff56800
x26: ffff0000e1c404d0 x25: dfff800000000000 x24: ffff80009ff56800
x23: dfff800000000000 x22: 0000000000000020 x21: ffff80009ff56800
x20: ffff0000c6009000 x19: 0000000000001000 x18: 0000000000000008
x17: 0000000000000000 x16: ffff800082f8f174 x15: 0000000000000001
x14: 1ffff00011e7a636 x13: 0000000000000000 x12: 0000000000000000
x11: ffff700011e7a637 x10: 0000000000ff0100 x9 : 0000000000000000
x8 : 0000000000000004 x7 : 0000000000000001 x6 : 0000000000000001
x5 : 00000000ffffffff x4 : 0000000000000cc0 x3 : 0000000000000040
x2 : 0000000000001000 x1 : ffff0000c6009000 x0 : ffff80009ff56800
Call trace:
 crypto_shash_alg include/crypto/hash.h:733 [inline]
 crypto_shash_update+0x50/0xa8 crypto/shash.c:52
 __bch2_checksum_bio+0xbf4/0x10d8 fs/bcachefs/checksum.c:300
 bch2_checksum_bio+0xc0/0x10c fs/bcachefs/checksum.c:319
 bch2_write_extent fs/bcachefs/io_write.c:1044 [inline]
 __bch2_write+0x1d20/0x47f4 fs/bcachefs/io_write.c:1461
 bch2_write+0x8bc/0x153c fs/bcachefs/io_write.c:1634
 closure_queue include/linux/closure.h:269 [inline]
 closure_call include/linux/closure.h:425 [inline]
 bch2_dio_write_loop fs/bcachefs/fs-io-direct.c:531 [inline]
 bch2_direct_write+0x1670/0x2988 fs/bcachefs/fs-io-direct.c:654
 bch2_write_iter+0x1a8/0x2d24 fs/bcachefs/fs-io-buffered.c:1135
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0x8f8/0xc38 fs/read_write.c:590
 ksys_write+0x15c/0x26c fs/read_write.c:643
 __do_sys_write fs/read_write.c:655 [inline]
 __se_sys_write fs/read_write.c:652 [inline]
 __arm64_sys_write+0x7c/0x90 fs/read_write.c:652
 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:131
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:150
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598
Code: 9778c38d f94002a8 91008116 d343fec8 (38776908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	9778c38d 	bl	0xfffffffffde30e34
   4:	f94002a8 	ldr	x8, [x21]
   8:	91008116 	add	x22, x8, #0x20
   c:	d343fec8 	lsr	x8, x22, #3
* 10:	38776908 	ldrb	w8, [x8, x23] <-- trapping instruction


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