BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 707de067 P4D 707de067 PUD 6b0be067 PMD 0 Oops: Oops: 0002 [#1] PREEMPT SMP KASAN NOPTI CPU: 3 UID: 0 PID: 6818 Comm: syz.2.206 Not tainted 6.12.0-syzkaller-11677-g2ba9f676d0a2 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:memcpy+0xc/0x20 arch/x86/lib/memcpy_64.S:38 Code: e9 44 fd ff ff 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 48 89 f8 48 89 d1 a4 c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 RSP: 0018:ffffc90022f6f8b0 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffffc90022f6fc50 RCX: 0000000000000005 RDX: 0000000000000005 RSI: ffff888011a00550 RDI: 0000000000000000 RBP: 0000000000000005 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000005 R13: 0000000000000000 R14: 0000000000000005 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff88802b700000(0063) knlGS:00000000f5176b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000069cc0000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: fuse_copy_do fs/fuse/dev.c:809 [inline] fuse_copy_one+0x1cc/0x230 fs/fuse/dev.c:1065 fuse_copy_args+0x109/0x690 fs/fuse/dev.c:1083 copy_out_args fs/fuse/dev.c:1966 [inline] fuse_dev_do_write+0x1b0a/0x3100 fs/fuse/dev.c:2052 fuse_dev_write+0x160/0x1f0 fs/fuse/dev.c:2087 new_sync_write fs/read_write.c:586 [inline] vfs_write+0x5ae/0x1150 fs/read_write.c:679 ksys_write+0x12b/0x250 fs/read_write.c:731 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf7ff3579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f5176520 EFLAGS: 00000293 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020000540 RDX: 0000000000000015 RSI: 00000000f7480ff4 RDI: 0000000000000000 RBP: 0000000020008380 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: CR2: 0000000000000000 ---[ end trace 0000000000000000 ]--- RIP: 0010:memcpy+0xc/0x20 arch/x86/lib/memcpy_64.S:38 Code: e9 44 fd ff ff 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 48 89 f8 48 89 d1 a4 c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 RSP: 0018:ffffc90022f6f8b0 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffffc90022f6fc50 RCX: 0000000000000005 RDX: 0000000000000005 RSI: ffff888011a00550 RDI: 0000000000000000 RBP: 0000000000000005 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000005 R13: 0000000000000000 R14: 0000000000000005 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff88802b700000(0063) knlGS:00000000f5176b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000069cc0000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: e9 44 fd ff ff jmp 0xfffffd49 5: 66 0f 1f 84 00 00 00 nopw 0x0(%rax,%rax,1) c: 00 00 e: 90 nop f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop 16: 90 nop 17: 90 nop 18: 90 nop 19: 90 nop 1a: 90 nop 1b: 90 nop 1c: 90 nop 1d: 90 nop 1e: f3 0f 1e fa endbr64 22: 66 90 xchg %ax,%ax 24: 48 89 f8 mov %rdi,%rax 27: 48 89 d1 mov %rdx,%rcx * 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction 2c: c3 ret 2d: cc int3 2e: cc int3 2f: cc int3 30: cc int3 31: 66 66 2e 0f 1f 84 00 data16 cs nopw 0x0(%rax,%rax,1) 38: 00 00 00 00 3c: 66 90 xchg %ax,%ax 3e: 90 nop 3f: 90 nop