8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000108 when read [00000108] *pgd=851c9003, *pmd=fe6a4003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 0 PID: 6330 Comm: syz-executor.0 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 : [<81741308>] lr : [<81743400>] psr: 00000013 sp : dfd89e40 ip : dfd89e50 fp : dfd89e4c r10: 5ac3c35a r9 : 7efffd08 r8 : 832a5490 r7 : 850f8800 r6 : 850f8824 r5 : 8527085c r4 : 85270800 r3 : 85271400 r2 : 825d5cd0 r1 : 85270800 r0 : 00000100 Flags: nzcv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85196980 DAC: fffffffd Register r0 information: non-paged memory Register r1 information: slab kmalloc-1k start 85270800 pointer offset 0 size 1024 Register r2 information: non-slab/vmalloc memory Register r3 information: slab kmalloc-1k start 85271400 pointer offset 0 size 1024 Register r4 information: slab kmalloc-1k start 85270800 pointer offset 0 size 1024 Register r5 information: slab kmalloc-1k start 85270800 pointer offset 92 size 1024 Register r6 information: slab kmalloc-2k start 850f8800 pointer offset 36 size 2048 Register r7 information: slab kmalloc-2k start 850f8800 pointer offset 0 size 2048 Register r8 information: slab cred_jar start 832a5480 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 0xdfd88000 allocated at kernel_clone+0x9c/0x3e0 kernel/fork.c:2684 Register r12 information: 2-page vmalloc region starting at 0xdfd88000 allocated at kernel_clone+0x9c/0x3e0 kernel/fork.c:2684 Process syz-executor.0 (pid: 6330, stack limit = 0xdfd88000) Stack: (0xdfd89e40 to 0xdfd8a000) 9e40: dfd89e64 dfd89e50 81743400 817412f0 85270800 8527085c dfd89e7c dfd89e68 9e60: 8173acd0 817433fc 850f8824 850f8824 dfd89ea4 dfd89e80 81747768 8173ac50 9e80: 850bdcc0 000e001b 83525220 83b33050 832a5490 7efffd08 dfd89ebc dfd89ea8 9ea0: 80a57558 817476e0 82b52780 000e001b dfd89ef4 dfd89ec0 804c1bd4 80a5754c 9ec0: 80277048 802a38bc 8020c2d8 8020d334 00000000 8312d884 8312d080 8264e5e0 9ee0: 8312d8b4 7efffd08 dfd89f04 dfd89ef8 804c1e30 804c1b5c dfd89f2c dfd89f08 9f00: 80267ad4 804c1e2c 8312d080 dfd89fb0 80200288 fffffe30 80200288 7efffd08 9f20: dfd89fac dfd89f30 8020c034 80267a54 804c1b08 80267820 7efffd08 8240c44c 9f40: dfd89f6c dfd89f50 804baf74 804c1a8c 00000003 82a12700 82a12740 82b52780 9f60: dfd89f94 dfd89f70 804e3928 804baf18 00000004 027534c0 0005b0ab c9db9568 9f80: 80200288 00000004 027534c0 0005b0ab 00000006 80200288 8312d080 00000006 9fa0: 00000000 dfd89fb0 80200088 8020bc1c 00000000 00000002 00000000 00000003 9fc0: 00000004 027534c0 0005b0ab 00000006 00140000 000003e8 0014c430 00000000 9fe0: 2cc20000 7ea803f8 0002a430 0002a8ec 80000010 00000003 00000000 00000000 Backtrace: [<817412e4>] (nfc_llcp_find_local) from [<81743400>] (nfc_llcp_unregister_device+0x10/0xbc net/nfc/llcp_core.c:1611) [<817433f0>] (nfc_llcp_unregister_device) from [<8173acd0>] (nfc_unregister_device+0x8c/0x118 net/nfc/core.c:1179) r5:8527085c r4:85270800 [<8173ac44>] (nfc_unregister_device) from [<81747768>] (nci_unregister_device+0x94/0x98 net/nfc/nci/core.c:1303) r5:850f8824 r4:850f8824 [<817476d4>] (nci_unregister_device) from [<80a57558>] (virtual_ncidev_close+0x18/0x30 drivers/nfc/virtual_ncidev.c:163) r9:7efffd08 r8:832a5490 r7:83b33050 r6:83525220 r5:000e001b r4:850bdcc0 [<80a57540>] (virtual_ncidev_close) from [<804c1bd4>] (__fput+0x84/0x264 fs/file_table.c:321) r5:000e001b r4:82b52780 [<804c1b50>] (__fput) from [<804c1e30>] (____fput+0x10/0x14 fs/file_table.c:349) r9:7efffd08 r8:8312d8b4 r7:8264e5e0 r6:8312d080 r5:8312d884 r4:00000000 [<804c1e20>] (____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:dfd89fb0 r4:8312d080 [<8020bc10>] (do_work_pending) from [<80200088>] (slow_work_pending+0xc/0x20) Exception stack(0xdfd89fb0 to 0xdfd89ff8) 9fa0: 00000000 00000002 00000000 00000003 9fc0: 00000004 027534c0 0005b0ab 00000006 00140000 000003e8 0014c430 00000000 9fe0: 2cc20000 7ea803f8 0002a430 0002a8ec 80000010 00000003 r10:00000006 r9:8312d080 r8:80200288 r7:00000006 r6:0005b0ab r5:027534c0 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