Good day, dear maintainers, We found a bug using a modified kernel configuration file used by syzbot. We enhanced the coverage of the configuration file using our tool, klocalizer. Kernel Branch: 6.2.0-next-20230224 Kernel config: https://drive.google.com/file/d/1nlVJD4vp7iMOPapFzdASZQ7JSiDf6SwY/view?usp=share_link C Reproducer: Unfortunately, there is no reproducer yet Thank you! Best regards, Sanan Hasanov general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 4 PID: 26115 Comm: syz-executor.2 Not tainted 6.2.0-next-20230224 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 RIP: 0010:nl802154_trigger_scan+0x132/0xc40 Code: 48 c1 ea 03 80 3c 02 00 0f 85 e1 09 00 00 48 8b ad f8 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d 7d 04 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 90 07 00 00 RSP: 0018:ffffc9000b087550 EFLAGS: 00010257 RAX: dffffc0000000000 RBX: ffffc9000b0875c0 RCX: ffffc9000df9a000 RDX: 0000000000000000 RSI: ffffffff88a65a91 RDI: 0000000000000004 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88810f098c10 R13: ffff88810f050000 R14: ffff88810f0500a0 R15: ffffc9000b0875e0 FS: 00007f7b8a7fe700(0000) GS:ffff88811a200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd3780efdc CR3: 000000004dd9e000 CR4: 0000000000350ee0 Call Trace: <TASK> genl_family_rcv_msg_doit.isra.0+0x1e6/0x2d0 genl_rcv_msg+0x4ff/0x7e0 netlink_rcv_skb+0x165/0x440 genl_rcv+0x28/0x40 netlink_unicast+0x547/0x7f0 netlink_sendmsg+0x92f/0xe50 sock_sendmsg+0xde/0x190 ____sys_sendmsg+0x717/0x900 ___sys_sendmsg+0x11d/0x1b0 __sys_sendmsg+0xfe/0x1d0 do_syscall_64+0x39/0x80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f7b8b88edcd Code: 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f7b8a7fdbf8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f7b8b9bbf80 RCX: 00007f7b8b88edcd RDX: 0000000000000000 RSI: 0000000020000380 RDI: 0000000000000004 RBP: 00007f7b8b8fc59c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd638e65bf R14: 00007ffd638e6760 R15: 00007f7b8a7fdd80 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:nl802154_trigger_scan+0x132/0xc40 Code: 48 c1 ea 03 80 3c 02 00 0f 85 e1 09 00 00 48 8b ad f8 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d 7d 04 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 90 07 00 00 RSP: 0018:ffffc9000b087550 EFLAGS: 00010257 RAX: dffffc0000000000 RBX: ffffc9000b0875c0 RCX: ffffc9000df9a000 RDX: 0000000000000000 RSI: ffffffff88a65a91 RDI: 0000000000000004 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88810f098c10 R13: ffff88810f050000 R14: ffff88810f0500a0 R15: ffffc9000b0875e0 FS: 00007f7b8a7fe700(0000) GS:ffff88811a200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd3780efdc CR3: 000000004dd9e000 CR4: 0000000000350ee0 ---------------- Code disassembly (best guess): 0: 48 c1 ea 03 shr $0x3,%rdx 4: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 8: 0f 85 e1 09 00 00 jne 0x9ef e: 48 8b ad f8 00 00 00 mov 0xf8(%rbp),%rbp 15: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 1c: fc ff df 1f: 48 8d 7d 04 lea 0x4(%rbp),%rdi 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax <-- trapping instruction 2e: 48 89 fa mov %rdi,%rdx 31: 83 e2 07 and $0x7,%edx 34: 38 d0 cmp %dl,%al 36: 7f 08 jg 0x40 38: 84 c0 test %al,%al 3a: 0f 85 90 07 00 00 jne 0x7d0
