Mass Storage Function, version: 2009/09/11
LUN: removable file: (no medium)
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
CPU: 0 UID: 0 PID: 313 Comm: syz-executor318 Not tainted syzkaller #0 6f2d7458894aba4127f3ede48a844fbc689668cc
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:fsg_common_set_num_buffers+0xa5/0x3b0 drivers/usb/gadget/function/f_mass_storage.c:2763
Code: 49 be 00 00 00 00 00 fc ff df 66 90 e8 c4 cd c9 fd bf 00 40 00 00 be c0 0c 00 00 e8 35 6b 1e fe 49 89 c7 4c 89 e0 48 c1 e8 03 <42> 80 3c 30 00 74 08 4c 89 e7 e8 2c a9 22 fe 4d 8d 75 f0 4d 89 3e
RSP: 0018:ffffc9000122fb20 EFLAGS: 00010202
RAX: 0000000000000002 RBX: 0000000000000001 RCX: 0000000000000002
RDX: 0000000000000003 RSI: ffffffff83bda9ab RDI: ffffed102447b800
RBP: ffffc9000122fb70 R08: 0000000000004000 R09: 0000000000000000
R10: ffffed102447b800 R11: fffff94000911ecc R12: 0000000000000010
R13: 0000000000000020 R14: dffffc0000000000 R15: ffff8881223d8000
FS:  000055555e6293c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fea6109e008 CR3: 000000011fc20000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 fsg_opts_num_buffers_store+0x13c/0x1c0 drivers/usb/gadget/function/f_mass_storage.c:3452
 flush_write_buffer fs/configfs/file.c:207 [inline]
 configfs_write_iter+0x32c/0x490 fs/configfs/file.c:229
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x762/0xfd0 fs/read_write.c:684
 ksys_write+0x145/0x260 fs/read_write.c:737
 __do_sys_write fs/read_write.c:749 [inline]
 __se_sys_write fs/read_write.c:746 [inline]
 __x64_sys_write+0x7f/0x90 fs/read_write.c:746
 x64_sys_call+0x271c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fea61001ef9
Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 0f 1f 44 00 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 73 01 c3 48 c7 c1 d8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffd96dec38 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000200000000300 RCX: 00007fea61001ef9
RDX: 0000000000000012 RSI: 0000200000000300 RDI: 0000000000000003
RBP: 6769666e6f632f2e R08: 000000000000000f R09: 00007fffd96ded78
R10: 0000000000000001 R11: 0000000000000246 R12: 00007fffd96ded68
R13: 0000000000000002 R14: 0000200000000008 R15: 0000000000000002
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:fsg_common_set_num_buffers+0xa5/0x3b0 drivers/usb/gadget/function/f_mass_storage.c:2763
Code: 49 be 00 00 00 00 00 fc ff df 66 90 e8 c4 cd c9 fd bf 00 40 00 00 be c0 0c 00 00 e8 35 6b 1e fe 49 89 c7 4c 89 e0 48 c1 e8 03 <42> 80 3c 30 00 74 08 4c 89 e7 e8 2c a9 22 fe 4d 8d 75 f0 4d 89 3e
RSP: 0018:ffffc9000122fb20 EFLAGS: 00010202
RAX: 0000000000000002 RBX: 0000000000000001 RCX: 0000000000000002
RDX: 0000000000000003 RSI: ffffffff83bda9ab RDI: ffffed102447b800
RBP: ffffc9000122fb70 R08: 0000000000004000 R09: 0000000000000000
R10: ffffed102447b800 R11: fffff94000911ecc R12: 0000000000000010
R13: 0000000000000020 R14: dffffc0000000000 R15: ffff8881223d8000
FS:  000055555e6293c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fea6109e008 CR3: 000000011fc20000 CR4: 00000000003526b0
----------------
Code disassembly (best guess):
   0:	49 be 00 00 00 00 00 	movabs $0xdffffc0000000000,%r14
   7:	fc ff df
   a:	66 90                	xchg   %ax,%ax
   c:	e8 c4 cd c9 fd       	call   0xfdc9cdd5
  11:	bf 00 40 00 00       	mov    $0x4000,%edi
  16:	be c0 0c 00 00       	mov    $0xcc0,%esi
  1b:	e8 35 6b 1e fe       	call   0xfe1e6b55
  20:	49 89 c7             	mov    %rax,%r15
  23:	4c 89 e0             	mov    %r12,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 30 00       	cmpb   $0x0,(%rax,%r14,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 e7             	mov    %r12,%rdi
  34:	e8 2c a9 22 fe       	call   0xfe22a965
  39:	4d 8d 75 f0          	lea    -0x10(%r13),%r14
  3d:	4d 89 3e             	mov    %r15,(%r14)