8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000108 when read [00000108] *pgd=8530c003, *pmd=fe6e8003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 675 Comm: syz-executor.1 Not tainted 6.2.0-syzkaller #0 Hardware name: ARM-Versatile Express PC is at nfc_llcp_find_local+0x24/0x6c net/nfc/llcp_core.c:287 LR is at nfc_llcp_unregister_device+0x10/0xbc net/nfc/llcp_core.c:1611 pc : [<81741f90>] lr : [<81744088>] psr: 00000013 sp : ede49e40 ip : ede49e50 fp : ede49e4c r10: 5ac3c35a r9 : 7efffd08 r8 : 830aa790 r7 : 84c58000 r6 : 84c58024 r5 : 8518145c r4 : 85181400 r3 : 83910400 r2 : 825d5cd0 r1 : 85181400 r0 : 00000100 Flags: nzcv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85317f00 DAC: fffffffd Register r0 information: non-paged memory Register r1 information: slab kmalloc-1k start 85181400 pointer offset 0 size 1024 Register r2 information: non-slab/vmalloc memory Register r3 information: slab kmalloc-1k start 83910400 pointer offset 0 size 1024 Register r4 information: slab kmalloc-1k start 85181400 pointer offset 0 size 1024 Register r5 information: slab kmalloc-1k start 85181400 pointer offset 92 size 1024 Register r6 information: slab kmalloc-2k start 84c58000 pointer offset 36 size 2048 Register r7 information: slab kmalloc-2k start 84c58000 pointer offset 0 size 2048 Register r8 information: slab cred_jar start 830aa780 pointer offset 16 size 176 Register r9 information: 2-page vmalloc region starting at 0x7f000000 allocated at bpf_jit_alloc_exec+0x10/0x14 kernel/bpf/core.c:1000 Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xede48000 allocated at kernel_clone+0x9c/0x3e0 kernel/fork.c:2684 Register r12 information: 2-page vmalloc region starting at 0xede48000 allocated at kernel_clone+0x9c/0x3e0 kernel/fork.c:2684 Process syz-executor.1 (pid: 675, stack limit = 0xede48000) Stack: (0xede49e40 to 0xede4a000) 9e40: ede49e64 ede49e50 81744088 81741f78 85181400 8518145c ede49e7c ede49e68 9e60: 8173b948 81744084 84c58024 84c58024 ede49ea4 ede49e80 817483f0 8173b8c8 9e80: 85821540 000e001b 83447dd0 82979650 830aa790 7efffd08 ede49ebc ede49ea8 9ea0: 80a57a68 81748368 850f7e40 000e001b ede49ef4 ede49ec0 804c1c98 80a57a5c 9ec0: 80277048 802a38bc 8020c2d8 8020d334 00000000 83287b04 83287300 8264e5e0 9ee0: 83287b34 7efffd08 ede49f04 ede49ef8 804c1ef4 804c1c20 ede49f2c ede49f08 9f00: 80267ad4 804c1ef0 83287300 ede49fb0 80200288 fffffe30 80200288 7efffd08 9f20: ede49fac ede49f30 8020c034 80267a54 804c1bcc 80267820 7efffd08 8240c44c 9f40: ede49f6c ede49f50 804bafb8 804c1b50 00000003 82a12c00 82a12c40 850f7e40 9f60: ede49f94 ede49f70 804e39ec 804baf5c 00000004 0124d4c0 00000000 c3b33284 9f80: 80200288 00000004 0124d4c0 00000000 00000006 80200288 83287300 00000006 9fa0: 00000000 ede49fb0 80200088 8020bc1c 00000000 00000002 00000000 00000003 9fc0: 00000004 0124d4c0 00000000 00000006 00140000 000003e8 7e8ed504 00000000 9fe0: 2c920000 7e8ed3f8 0002a430 0002a8ec 80000010 00000003 00000000 00000000 Backtrace: [<81741f6c>] (nfc_llcp_find_local) from [<81744088>] (nfc_llcp_unregister_device+0x10/0xbc net/nfc/llcp_core.c:1611) [<81744078>] (nfc_llcp_unregister_device) from [<8173b948>] (nfc_unregister_device+0x8c/0x118 net/nfc/core.c:1179) r5:8518145c r4:85181400 [<8173b8bc>] (nfc_unregister_device) from [<817483f0>] (nci_unregister_device+0x94/0x98 net/nfc/nci/core.c:1303) r5:84c58024 r4:84c58024 [<8174835c>] (nci_unregister_device) from [<80a57a68>] (virtual_ncidev_close+0x18/0x30 drivers/nfc/virtual_ncidev.c:163) r9:7efffd08 r8:830aa790 r7:82979650 r6:83447dd0 r5:000e001b r4:85821540 [<80a57a50>] (virtual_ncidev_close) from [<804c1c98>] (__fput+0x84/0x264 fs/file_table.c:321) r5:000e001b r4:850f7e40 [<804c1c14>] (__fput) from [<804c1ef4>] (____fput+0x10/0x14 fs/file_table.c:349) r9:7efffd08 r8:83287b34 r7:8264e5e0 r6:83287300 r5:83287b04 r4:00000000 [<804c1ee4>] (____fput) from [<80267ad4>] (task_work_run+0x8c/0xb4 kernel/task_work.c:179) [<80267a48>] (task_work_run) from [<8020c034>] (resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]) [<80267a48>] (task_work_run) from [<8020c034>] (do_work_pending+0x424/0x528 arch/arm/kernel/signal.c:630) r9:7efffd08 r8:80200288 r7:fffffe30 r6:80200288 r5:ede49fb0 r4:83287300 [<8020bc10>] (do_work_pending) from [<80200088>] (slow_work_pending+0xc/0x20) Exception stack(0xede49fb0 to 0xede49ff8) 9fa0: 00000000 00000002 00000000 00000003 9fc0: 00000004 0124d4c0 00000000 00000006 00140000 000003e8 7e8ed504 00000000 9fe0: 2c920000 7e8ed3f8 0002a430 0002a8ec 80000010 00000003 r10:00000006 r9:83287300 r8:80200288 r7:00000006 r6:00000000 r5:0124d4c0 r4:00000004 Code: e1a01000 e5b20004 e1500002 0a000005 (e5903008) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e1a01000 mov r1, r0 4: e5b20004 ldr r0, [r2, #4]! 8: e1500002 cmp r0, r2 c: 0a000005 beq 0x28 * 10: e5903008 ldr r3, [r0, #8] <-- trapping instruction