8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 00000108 when read [00000108] *pgd=8514d003, *pmd=fe614003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 5273 Comm: syz-executor.1 Not tainted 6.2.0-rc4-syzkaller #0 Hardware name: ARM-Versatile Express PC is at nfc_llcp_find_local+0x24/0x6c net/nfc/llcp_core.c:286 LR is at nfc_llcp_unregister_device+0x10/0xbc net/nfc/llcp_core.c:1610 pc : [<8171a264>] lr : [<8171c35c>] psr: 00000013 sp : ed101e40 ip : ed101e50 fp : ed101e4c r10: 5ac3c35a r9 : 7efffd08 r8 : 830eb250 r7 : 84b10800 r6 : 84b10824 r5 : 843c585c r4 : 843c5800 r3 : 84099000 r2 : 825d06f8 r1 : 843c5800 r0 : 00000100 Flags: nzcv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 850e4b00 DAC: 00000000 Register r0 information: non-paged memory Register r1 information: slab kmalloc-1k start 843c5800 pointer offset 0 size 1024 Register r2 information: non-slab/vmalloc memory Register r3 information: slab kmalloc-1k start 84099000 pointer offset 0 size 1024 Register r4 information: slab kmalloc-1k start 843c5800 pointer offset 0 size 1024 Register r5 information: slab kmalloc-1k start 843c5800 pointer offset 92 size 1024 Register r6 information: slab kmalloc-2k start 84b10800 pointer offset 36 size 2048 Register r7 information: slab kmalloc-2k start 84b10800 pointer offset 0 size 2048 Register r8 information: slab cred_jar start 830eb240 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:998 Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xed100000 allocated at kernel_clone+0x9c/0x400 kernel/fork.c:2681 Register r12 information: 2-page vmalloc region starting at 0xed100000 allocated at kernel_clone+0x9c/0x400 kernel/fork.c:2681 Process syz-executor.1 (pid: 5273, stack limit = 0xed100000) Stack: (0xed101e40 to 0xed102000) 1e40: ed101e64 ed101e50 8171c35c 8171a24c 843c5800 843c585c ed101e7c ed101e68 1e60: 81713c34 8171c358 84b10824 84b10824 ed101ea4 ed101e80 817206c4 81713bb4 1e80: 851483c0 000e001b 83537e58 8396ec50 830eb250 7efffd08 ed101ebc ed101ea8 1ea0: 80a3376c 8172063c 82abd480 000e001b ed101ef4 ed101ec0 804b2c88 80a33760 1ec0: 80275aa0 802a17b0 8020c31c 8020d378 00000000 83e74d04 83e74500 826475e4 1ee0: 83e74d34 7efffd08 ed101f04 ed101ef8 804b2ee4 804b2c10 ed101f2c ed101f08 1f00: 802666a4 804b2ee0 83e74500 ed101fb0 80200288 fffffe30 80200288 7efffd08 1f20: ed101fac ed101f30 8020c078 80266624 804b2bbc 802663f0 7efffd08 8240c44c 1f40: ed101f6c ed101f50 804abfb8 804b2b40 00000003 840bd000 840bd040 82abd480 1f60: ed101f94 ed101f70 804d5310 804abf60 00000004 0132c4c0 00079acf 96cb2a87 1f80: 80200288 00000004 0132c4c0 00079acf 00000006 80200288 83e74500 00000006 1fa0: 00000000 ed101fb0 80200088 8020bc60 00000000 00000002 00000000 00000003 1fc0: 00000004 0132c4c0 00079acf 00000006 00140000 000003e8 7ee20514 00000000 1fe0: 2c420000 7ee20408 0002a3e0 0002a89c 80000010 00000003 00000000 00000000 Backtrace: [<8171a240>] (nfc_llcp_find_local) from [<8171c35c>] (nfc_llcp_unregister_device+0x10/0xbc net/nfc/llcp_core.c:1610) [<8171c34c>] (nfc_llcp_unregister_device) from [<81713c34>] (nfc_unregister_device+0x8c/0x118 net/nfc/core.c:1179) r5:843c585c r4:843c5800 [<81713ba8>] (nfc_unregister_device) from [<817206c4>] (nci_unregister_device+0x94/0x98 net/nfc/nci/core.c:1303) r5:84b10824 r4:84b10824 [<81720630>] (nci_unregister_device) from [<80a3376c>] (virtual_ncidev_close+0x18/0x30 drivers/nfc/virtual_ncidev.c:163) r9:7efffd08 r8:830eb250 r7:8396ec50 r6:83537e58 r5:000e001b r4:851483c0 [<80a33754>] (virtual_ncidev_close) from [<804b2c88>] (__fput+0x84/0x264 fs/file_table.c:320) r5:000e001b r4:82abd480 [<804b2c04>] (__fput) from [<804b2ee4>] (____fput+0x10/0x14 fs/file_table.c:348) r9:7efffd08 r8:83e74d34 r7:826475e4 r6:83e74500 r5:83e74d04 r4:00000000 [<804b2ed4>] (____fput) from [<802666a4>] (task_work_run+0x8c/0xb4 kernel/task_work.c:179) [<80266618>] (task_work_run) from [<8020c078>] (resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]) [<80266618>] (task_work_run) from [<8020c078>] (do_work_pending+0x424/0x528 arch/arm/kernel/signal.c:630) r9:7efffd08 r8:80200288 r7:fffffe30 r6:80200288 r5:ed101fb0 r4:83e74500 [<8020bc54>] (do_work_pending) from [<80200088>] (slow_work_pending+0xc/0x20) Exception stack(0xed101fb0 to 0xed101ff8) 1fa0: 00000000 00000002 00000000 00000003 1fc0: 00000004 0132c4c0 00079acf 00000006 00140000 000003e8 7ee20514 00000000 1fe0: 2c420000 7ee20408 0002a3e0 0002a89c 80000010 00000003 r10:00000006 r9:83e74500 r8:80200288 r7:00000006 r6:00079acf r5:0132c4c0 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