Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 1 UID: 0 PID: 12745 Comm: syz.0.1545 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:dvb_device_open+0x111/0x3b0 drivers/media/dvb-core/dvbdev.c:103 Code: 00 0f 85 4c 02 00 00 4c 8b 6d 18 4d 85 ed 0f 84 0e 02 00 00 e8 e0 ad e0 f9 4c 89 ea 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 75 02 00 00 49 8b 7d 00 e8 3c df c8 f9 31 ff 89 RSP: 0000:ffffc90004ff7938 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc900077a2000 RDX: 0000000000000003 RSI: ffffffff882ae310 RDI: ffff888025c0c218 RBP: ffff888025c0c200 R08: 0000000000000001 R09: fffffbfff20b48c5 R10: ffffffff905a462f R11: 0000000000000001 R12: ffff888014410e00 R13: 0000000000000018 R14: ffff888025849360 R15: ffff888014410e48 FS: 0000000000000000(0000) GS:ffff888096a55000(0063) knlGS:00000000f53e6b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000f739ff64 CR3: 0000000029214000 CR4: 0000000000352ef0 Call Trace: chrdev_open+0x234/0x6a0 fs/char_dev.c:411 do_dentry_open+0x6ab/0x14d0 fs/open.c:996 vfs_open+0x82/0x3f0 fs/open.c:1101 do_open fs/namei.c:4837 [inline] path_openat+0x19fa/0x2440 fs/namei.c:5000 do_file_open+0x20e/0x430 fs/namei.c:5029 do_sys_openat2+0x10f/0x1e0 fs/open.c:1417 do_sys_open fs/open.c:1423 [inline] __do_compat_sys_openat fs/open.c:1485 [inline] __se_compat_sys_openat fs/open.c:1483 [inline] __ia32_compat_sys_openat+0x12d/0x210 fs/open.c:1483 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:79 [inline] do_int80_emulation+0x166/0x650 arch/x86/entry/syscall_32.c:166 asm_int80_emulation+0x1a/0x20 arch/x86/include/asm/idtentry.h:598 RIP: 0023:0xf71275ab Code: 57 56 53 8b 44 24 14 f6 00 08 75 23 8b 44 24 18 8b 5c 24 1c 8b 4c 24 20 8b 54 24 24 8b 74 24 28 8b 7c 24 2c 8b 6c 24 30 cd 80 <5b> 5e 5f 5d c3 5b 5e 5f 5d e9 f7 a1 ff ff 66 90 66 90 66 90 90 53 RSP: 002b:00000000f53e603c EFLAGS: 00000246 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 00000000ffffff9c RCX: 00000000f53e6100 RDX: 0000000000040002 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:dvb_device_open+0x111/0x3b0 drivers/media/dvb-core/dvbdev.c:103 Code: 00 0f 85 4c 02 00 00 4c 8b 6d 18 4d 85 ed 0f 84 0e 02 00 00 e8 e0 ad e0 f9 4c 89 ea 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 75 02 00 00 49 8b 7d 00 e8 3c df c8 f9 31 ff 89 RSP: 0000:ffffc90004ff7938 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc900077a2000 RDX: 0000000000000003 RSI: ffffffff882ae310 RDI: ffff888025c0c218 RBP: ffff888025c0c200 R08: 0000000000000001 R09: fffffbfff20b48c5 R10: ffffffff905a462f R11: 0000000000000001 R12: ffff888014410e00 R13: 0000000000000018 R14: ffff888025849360 R15: ffff888014410e48 FS: 0000000000000000(0000) GS:ffff888096a55000(0063) knlGS:00000000f53e6b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00007f56d883ead0 CR3: 0000000029214000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: 00 0f add %cl,(%rdi) 2: 85 4c 02 00 test %ecx,0x0(%rdx,%rax,1) 6: 00 4c 8b 6d add %cl,0x6d(%rbx,%rcx,4) a: 18 4d 85 sbb %cl,-0x7b(%rbp) d: ed in (%dx),%eax e: 0f 84 0e 02 00 00 je 0x222 14: e8 e0 ad e0 f9 call 0xf9e0adf9 19: 4c 89 ea mov %r13,%rdx 1c: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 23: fc ff df 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 75 02 00 00 jne 0x2a9 34: 49 8b 7d 00 mov 0x0(%r13),%rdi 38: e8 3c df c8 f9 call 0xf9c8df79 3d: 31 ff xor %edi,%edi 3f: 89 .byte 0x89