netlink: 16 bytes leftover after parsing attributes in process `syz-executor.0'. kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 7807 Comm: in:imklog Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 RIP: 0010:mac80211_hwsim_tx_frame_nl+0x403/0x1230 drivers/net/wireless/mac80211_hwsim.c:1114 Code: 48 c1 ea 03 80 3c 02 00 0f 85 7e 0d 00 00 4c 8b ab 88 12 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d 7d 04 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 01 38 d0 7c 09 84 d2 74 05 e8 RSP: 0018:ffff8880ba107c40 EFLAGS: 00010247 RAX: dffffc0000000000 RBX: ffff8880615ed720 RCX: ffffffff84a67677 RDX: 0000000000000000 RSI: ffffffff84a67685 RDI: 0000000000000004 RBP: ffff8880b3364bc0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880ba107cc8 R13: 0000000000000000 R14: ffff88805bbb7d00 R15: ffff8880615ebe00 FS: 00007f5107142700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f90be800000 CR3: 00000000a9818000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: mac80211_hwsim_tx_frame+0x159/0x210 drivers/net/wireless/mac80211_hwsim.c:1554 mac80211_hwsim_beacon_tx+0x3f8/0x680 drivers/net/wireless/mac80211_hwsim.c:1595 __iterate_interfaces+0x2e1/0x4a0 net/mac80211/util.c:614 ieee80211_iterate_active_interfaces_atomic+0x8d/0x170 net/mac80211/util.c:650 mac80211_hwsim_beacon+0xc9/0x190 drivers/net/wireless/mac80211_hwsim.c:1615 __tasklet_hrtimer_trampoline+0x29/0xa0 kernel/softirq.c:601 tasklet_action_common.constprop.0+0x265/0x360 kernel/softirq.c:522 __do_softirq+0x265/0x980 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x215/0x260 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1098 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:kfree+0x123/0x210 mm/slab.c:3823 Code: 89 ea 48 89 ee 4c 89 e7 e8 da ee ff ff f6 c7 02 74 ca e8 20 74 cf ff 48 83 3d 60 4d 59 08 00 0f 84 eb 00 00 00 48 89 df 57 9d <0f> 1f 44 00 00 5b 5d 41 5c 41 5d c3 65 8b 05 ea 4b 69 7e 83 f8 07 RSP: 0018:ffff88809df5fa90 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: 0000000000000286 RCX: 1ffff1101416ad8d RDX: 0000000000000000 RSI: ffff8880a0b56c48 RDI: 0000000000000286 RBP: ffff88809cc27240 R08: 0000000000400000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88813bff0ac0 R13: ffffffff814d928c R14: 0000000000000063 R15: 00007f5107121e03 syslog_print kernel/printk/printk.c:1388 [inline] do_syslog.part.0+0x53c/0x1510 kernel/printk/printk.c:1505 do_syslog+0x49/0x60 kernel/printk/printk.c:1486 kmsg_read+0x8a/0xb0 fs/proc/kmsg.c:40 proc_reg_read+0x1bd/0x2d0 fs/proc/inode.c:231 __vfs_read+0xf7/0x750 fs/read_write.c:416 vfs_read+0x194/0x3c0 fs/read_write.c:452 ksys_read+0x12b/0x2a0 fs/read_write.c:579 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f510978522d Code: c1 20 00 00 75 10 b8 00 00 00 00 0f 05 48 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 4e fc ff ff 48 89 04 24 b8 00 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 97 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007f5107121580 EFLAGS: 00000293 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f510978522d RDX: 0000000000001fa0 RSI: 00007f5107121da0 RDI: 0000000000000004 RBP: 000055f905ce79d0 R08: 0000000000000000 R09: 0000000004000001 R10: 0000000000000001 R11: 0000000000000293 R12: 00007f5107121da0 R13: 0000000000001fa0 R14: 0000000000001f9f R15: 00007f5107121e08 Modules linked in: ---[ end trace a618f4b3054e4394 ]--- RIP: 0010:mac80211_hwsim_tx_frame_nl+0x403/0x1230 drivers/net/wireless/mac80211_hwsim.c:1114 Code: 48 c1 ea 03 80 3c 02 00 0f 85 7e 0d 00 00 4c 8b ab 88 12 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d 7d 04 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 01 38 d0 7c 09 84 d2 74 05 e8 RSP: 0018:ffff8880ba107c40 EFLAGS: 00010247 RAX: dffffc0000000000 RBX: ffff8880615ed720 RCX: ffffffff84a67677 RDX: 0000000000000000 RSI: ffffffff84a67685 RDI: 0000000000000004 RBP: ffff8880b3364bc0 R08: 0000000000000001 R09: 0000000000000000 mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880ba107cc8 R13: 0000000000000000 R14: ffff88805bbb7d00 R15: ffff8880615ebe00 FS: 00007f5107142700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f90be800000 CR3: 00000000a9818000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- 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 7e 0d 00 00 jne 0xd8c e: 4c 8b ab 88 12 00 00 mov 0x1288(%rbx),%r13 15: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 1c: fc ff df 1f: 49 8d 7d 04 lea 0x4(%r13),%rdi 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx <-- trapping instruction 2e: 48 89 f8 mov %rdi,%rax 31: 83 e0 07 and $0x7,%eax 34: 83 c0 01 add $0x1,%eax 37: 38 d0 cmp %dl,%al 39: 7c 09 jl 0x44 3b: 84 d2 test %dl,%dl 3d: 74 05 je 0x44 3f: e8 .byte 0xe8