==================================================================
BUG: KASAN: use-after-free in memset include/linux/string.h:365 [inline]
BUG: KASAN: use-after-free in __alloc_skb+0x37b/0x5e0 net/core/skbuff.c:238
Write of size 32 at addr ffff88819e655dc0 by task udevd/8967

CPU: 0 PID: 8967 Comm: udevd Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x197/0x210 lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374
 __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506
 kasan_report+0x12/0x20 mm/kasan/common.c:639
 check_memory_region_inline mm/kasan/generic.c:185 [inline]
 check_memory_region+0x134/0x1a0 mm/kasan/generic.c:192
 memset+0x24/0x40 mm/kasan/common.c:108
 memset include/linux/string.h:365 [inline]
 __alloc_skb+0x37b/0x5e0 net/core/skbuff.c:238
 alloc_skb include/linux/skbuff.h:1049 [inline]
 igmpv3_newpack+0x1b9/0x1110 net/ipv4/igmp.c:361
 add_grhead.isra.0+0x235/0x300 net/ipv4/igmp.c:442
 add_grec+0x842/0x1230 net/ipv4/igmp.c:575
 igmpv3_send_cr net/ipv4/igmp.c:712 [inline]
 igmp_ifc_timer_expire+0x4af/0xab0 net/ipv4/igmp.c:809
 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1404
 expire_timers kernel/time/timer.c:1449 [inline]
 __run_timers kernel/time/timer.c:1773 [inline]
 __run_timers kernel/time/timer.c:1740 [inline]
 run_timer_softirq+0x6c3/0x1790 kernel/time/timer.c:1786
 __do_softirq+0x262/0x98c kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x19b/0x1e0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1137
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:__sanitizer_cov_trace_switch+0x73/0x80 kernel/kcov.c:301
Code: 49 39 dd 75 e9 5b 41 5c 41 5d 5d c3 48 83 f8 40 bf 07 00 00 00 74 cc 5b 41 5c 41 5d 5d c3 bf 01 00 00 00 eb be bf 05 00 00 00 <eb> b7 90 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 55 49 c7 c5
RSP: 0018:ffffc90001de7dd0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000020 RBX: 0000000000000fe0 RCX: ffffffff81bb9fc6
RDX: 0000000000000000 RSI: ffffffff88361d00 RDI: 0000000000000005
RBP: ffffc90001de7de8 R08: ffff888096014080 R09: 0000000000000000
R10: ffffed1012c98faf R11: ffff8880964c7d7f R12: ffffffff88361d00
R13: 0000000000000000 R14: ffff8880964c7d80 R15: 0000000053f9f150
 __check_object_size mm/usercopy.c:269 [inline]
 __check_object_size+0xb2/0x437 mm/usercopy.c:256
 check_object_size include/linux/thread_info.h:119 [inline]
 strncpy_from_user+0xa8/0x400 lib/strncpy_from_user.c:118
 getname_flags fs/namei.c:149 [inline]
 getname_flags+0x11b/0x5b0 fs/namei.c:128
 getname+0x1a/0x20 fs/namei.c:209
 __do_sys_execve fs/exec.c:1960 [inline]
 __se_sys_execve fs/exec.c:1955 [inline]
 __x64_sys_execve+0x73/0xc0 fs/exec.c:1955
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fa81aad8207
Code: 77 19 f4 48 89 d7 44 89 c0 0f 05 48 3d 00 f0 ff ff 76 e0 f7 d8 64 41 89 01 eb d8 f7 d8 64 41 89 01 eb df b8 3b 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 02 f3 c3 48 8b 15 00 8c 2d 00 f7 d8 64 89 02
RSP: 002b:00007fffac05e9a8 EFLAGS: 00000202 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00007fa81aad8207
RDX: 00000000008fbe80 RSI: 00007fffac05eaa0 RDI: 00007fffac05feb0
RBP: 0000000000625500 R08: 00000000000022f4 R09: 00000000000022f4
R10: 0000000000000000 R11: 0000000000000202 R12: 00000000008fbe80
R13: 00000000ffffffff R14: 00000000008e3250 R15: 0000000000000005