audit: type=1400 audit(1587893087.566:8): avc: denied { execmem } for pid=6339 comm="syz-executor651" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 ================================================================== BUG: KASAN: null-ptr-deref in memset include/linux/string.h:332 [inline] BUG: KASAN: null-ptr-deref in choke_reset+0x1fc/0x330 net/sched/sch_choke.c:330 Write of size 8 at addr (null) by task syz-executor651/6341 CPU: 0 PID: 6341 Comm: syz-executor651 Not tainted 4.14.177-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x13e/0x194 lib/dump_stack.c:58 kasan_report_error mm/kasan/report.c:349 [inline] kasan_report mm/kasan/report.c:409 [inline] kasan_report.cold+0x127/0x2ae mm/kasan/report.c:393 memset+0x20/0x40 mm/kasan/kasan.c:285 memset include/linux/string.h:332 [inline] choke_reset+0x1fc/0x330 net/sched/sch_choke.c:330 qdisc_reset+0x61/0x1e0 net/sched/sch_generic.c:678 dev_deactivate_queue.constprop.0+0xc5/0x150 net/sched/sch_generic.c:867 netdev_for_each_tx_queue include/linux/netdevice.h:1970 [inline] dev_deactivate_many+0xd6/0x960 net/sched/sch_generic.c:922 dev_deactivate+0xe2/0x190 net/sched/sch_generic.c:955 qdisc_graft+0x989/0xcd0 net/sched/sch_api.c:919 tc_modify_qdisc+0x99e/0x1181 net/sched/sch_api.c:1446 rtnetlink_rcv_msg+0x3be/0xb10 net/core/rtnetlink.c:4315 netlink_rcv_skb+0x127/0x370 net/netlink/af_netlink.c:2433 netlink_unicast_kernel net/netlink/af_netlink.c:1287 [inline] netlink_unicast+0x437/0x620 net/netlink/af_netlink.c:1313 netlink_sendmsg+0x733/0xbe0 net/netlink/af_netlink.c:1878 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xc5/0x100 net/socket.c:656 ___sys_sendmsg+0x70a/0x840 net/socket.c:2062 __sys_sendmsg+0xa3/0x120 net/socket.c:2096 SYSC_sendmsg net/socket.c:2107 [inline] SyS_sendmsg+0x27/0x40 net/socket.c:2103 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x441499 RSP: 002b:00007ffddc2ad438 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441499 RDX: 0000000000000000 RSI: 00000000200007c0 RDI: 0000000000000004 RBP: 00000000000098ca R08: 00000000004002c8 R09: 00000000004002c8 R10: 00000000004002c8 R11: 0000000000000246 R12: 00000000004022c0 R13: 0000000000402350 R14: 0000000000000000 R15: 0000000000000000 ==================================================================