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 Modules linked in: CPU: 0 PID: 8034 Comm: syz-executor734 Not tainted 4.14.290-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 task: ffff8880b397c680 task.stack: ffff888097a40000 RIP: 0010:vb2_vmalloc_put_userptr+0x6a/0x210 drivers/media/v4l2-core/videobuf2-vmalloc.c:136 RSP: 0018:ffff888097a478b8 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffffffff103fda4 RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000000009 RBP: ffff88809908fe00 R08: 0000000000000000 R09: 0000000000040548 R10: ffff8880b397cf30 R11: ffff8880b397c680 R12: 0000000000000000 R13: ffff88809908fe08 R14: ffffc90006917000 R15: ffff88809908fe00 FS: 00007feb8078e700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007feb80852e88 CR3: 00000000a11bf000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __vb2_buf_userptr_put drivers/media/v4l2-core/videobuf2-core.c:256 [inline] __vb2_free_mem drivers/media/v4l2-core/videobuf2-core.c:413 [inline] __vb2_queue_free+0x394/0x7a0 drivers/media/v4l2-core/videobuf2-core.c:454 vb2_core_queue_release+0x5b/0x70 drivers/media/v4l2-core/videobuf2-core.c:2054 vb2_queue_release drivers/media/v4l2-core/videobuf2-v4l2.c:669 [inline] _vb2_fop_release+0x1c1/0x280 drivers/media/v4l2-core/videobuf2-v4l2.c:840 vivid_fop_release+0x17d/0x6c0 drivers/media/platform/vivid/vivid-core.c:486 v4l2_release+0xf4/0x190 drivers/media/v4l2-core/v4l2-dev.c:446 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xa44/0x2850 kernel/exit.c:868 do_group_exit+0x100/0x2e0 kernel/exit.c:965 get_signal+0x38d/0x1ca0 kernel/signal.c:2412 do_signal+0x7c/0x1550 arch/x86/kernel/signal.c:792 exit_to_usermode_loop+0x160/0x200 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7feb808021d9 RSP: 002b:00007feb8078e318 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007feb808853f8 RCX: 00007feb808021d9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007feb808853f8 RBP: 00007feb808853f0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 7277732f7665642f R13: 00007ffd0d3a885f R14: 00007feb8078e400 R15: 0000000000022000 Code: 4c 89 ea 48 c1 ea 03 80 3c 02 00 0f 85 91 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 65 08 49 8d 7c 24 09 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 40 01 00 RIP: vb2_vmalloc_put_userptr+0x6a/0x210 drivers/media/v4l2-core/videobuf2-vmalloc.c:136 RSP: ffff888097a478b8 ---[ end trace ecc2587ba2abb3a9 ]--- ---------------- Code disassembly (best guess): 0: 4c 89 ea mov %r13,%rdx 3: 48 c1 ea 03 shr $0x3,%rdx 7: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) b: 0f 85 91 01 00 00 jne 0x1a2 11: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 18: fc ff df 1b: 4c 8b 65 08 mov 0x8(%rbp),%r12 1f: 49 8d 7c 24 09 lea 0x9(%r12),%rdi 24: 48 89 fa mov %rdi,%rdx 27: 48 c1 ea 03 shr $0x3,%rdx * 2b: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax <-- trapping instruction 2f: 48 89 fa mov %rdi,%rdx 32: 83 e2 07 and $0x7,%edx 35: 38 d0 cmp %dl,%al 37: 7f 08 jg 0x41 39: 84 c0 test %al,%al 3b: 0f .byte 0xf 3c: 85 40 01 test %eax,0x1(%rax)