================================================================== BUG: KASAN: slab-out-of-bounds in __dev_queue_xmit+0x1653/0x1b90 net/core/dev.c:3431 Read of size 4 at addr ffff880162c94224 by task syz-executor.1/13656 CPU: 0 PID: 13656 Comm: syz-executor.1 Not tainted 4.9.141+ #23 ffff8800001c70f8 ffffffff81b42e79 ffffea00058b2500 ffff880162c94224 0000000000000000 ffff880162c94224 ffff8800a85a6c10 ffff8800001c7130 ffffffff815009b8 ffff880162c94224 0000000000000004 0000000000000000 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] print_address_description+0x6c/0x234 mm/kasan/report.c:256 [] kasan_report_error mm/kasan/report.c:355 [inline] [] kasan_report.cold.6+0x242/0x2fe mm/kasan/report.c:412 [] __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432 [] __dev_queue_xmit+0x1653/0x1b90 net/core/dev.c:3431 [] dev_queue_xmit+0x17/0x20 net/core/dev.c:3506 [] neigh_resolve_output+0x600/0x780 net/core/neighbour.c:1325 [] dst_neigh_output include/net/dst.h:470 [inline] [] ip6_finish_output2+0xb0e/0x1d10 net/ipv6/ip6_output.c:119 [] ip6_finish_output+0x334/0x980 net/ipv6/ip6_output.c:145 [] NF_HOOK_COND include/linux/netfilter.h:246 [inline] [] ip6_output+0x1ea/0x6d0 net/ipv6/ip6_output.c:162 [] dst_output include/net/dst.h:507 [inline] [] ip6_local_out+0x9b/0x180 net/ipv6/output_core.c:176 [] ip6_send_skb+0xa1/0x340 net/ipv6/ip6_output.c:1751 [] udp_v6_send_skb+0x429/0xe70 net/ipv6/udp.c:974 [] udpv6_sendmsg+0x1ebb/0x2430 net/ipv6/udp.c:1246 [] inet_sendmsg+0x203/0x4d0 net/ipv4/af_inet.c:770 [] sock_sendmsg_nosec net/socket.c:648 [inline] [] sock_sendmsg+0xbb/0x110 net/socket.c:658 [] ___sys_sendmsg+0x47a/0x840 net/socket.c:1982 [] __sys_sendmmsg+0x23c/0x3d0 net/socket.c:2065 [] C_SYSC_sendmmsg net/compat.c:742 [inline] [] compat_SyS_sendmmsg+0x32/0x40 net/compat.c:739 [] do_syscall_32_irqs_on arch/x86/entry/common.c:328 [inline] [] do_fast_syscall_32+0x2f1/0xa10 arch/x86/entry/common.c:390 [] entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137 Allocated by task 13671: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack mm/kasan/kasan.c:505 [inline] set_track mm/kasan/kasan.c:517 [inline] kasan_kmalloc.part.1+0x62/0xf0 mm/kasan/kasan.c:609 kasan_kmalloc+0xaf/0xc0 mm/kasan/kasan.c:594 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:547 slab_post_alloc_hook mm/slab.h:417 [inline] slab_alloc_node mm/slub.c:2715 [inline] slab_alloc mm/slub.c:2723 [inline] __kmalloc_track_caller+0xf0/0x2d0 mm/slub.c:4232 __kmalloc_reserve.isra.5+0x33/0xc0 net/core/skbuff.c:138 __alloc_skb+0x11a/0x5b0 net/core/skbuff.c:231 alloc_skb include/linux/skbuff.h:924 [inline] alloc_skb_with_frags+0xaf/0x4e0 net/core/skbuff.c:4707 sock_alloc_send_pskb+0x59e/0x740 net/core/sock.c:1893 sock_alloc_send_skb+0x32/0x40 net/core/sock.c:1910 __ip6_append_data.isra.3+0x1fd2/0x3460 net/ipv6/ip6_output.c:1485 ip6_make_skb+0x291/0x480 net/ipv6/ip6_output.c:1831 udpv6_sendmsg+0x1e89/0x2430 net/ipv6/udp.c:1240 inet_sendmsg+0x203/0x4d0 net/ipv4/af_inet.c:770 sock_sendmsg_nosec net/socket.c:648 [inline] sock_sendmsg+0xbb/0x110 net/socket.c:658 ___sys_sendmsg+0x47a/0x840 net/socket.c:1982 __sys_sendmmsg+0x23c/0x3d0 net/socket.c:2065 C_SYSC_sendmmsg net/compat.c:742 [inline] compat_SyS_sendmmsg+0x32/0x40 net/compat.c:739 do_syscall_32_irqs_on arch/x86/entry/common.c:328 [inline] do_fast_syscall_32+0x2f1/0xa10 arch/x86/entry/common.c:390 entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137 Freed by task 13671: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack mm/kasan/kasan.c:505 [inline] set_track mm/kasan/kasan.c:517 [inline] kasan_slab_free+0xac/0x190 mm/kasan/kasan.c:582 slab_free_hook mm/slub.c:1355 [inline] slab_free_freelist_hook mm/slub.c:1377 [inline] slab_free mm/slub.c:2958 [inline] kfree+0xfb/0x310 mm/slub.c:3878 skb_free_head+0x8b/0xb0 net/core/skbuff.c:580 skb_release_data+0x338/0x3d0 net/core/skbuff.c:611 skb_release_all+0x4a/0x60 net/core/skbuff.c:670 __kfree_skb net/core/skbuff.c:684 [inline] kfree_skb+0xcc/0x340 net/core/skbuff.c:705 __neigh_event_send+0x647/0xc30 net/core/neighbour.c:1016 neigh_event_send include/net/neighbour.h:431 [inline] neigh_resolve_output+0x629/0x780 net/core/neighbour.c:1309 dst_neigh_output include/net/dst.h:470 [inline] ip6_finish_output2+0xb0e/0x1d10 net/ipv6/ip6_output.c:119 ip6_finish_output+0x334/0x980 net/ipv6/ip6_output.c:145 NF_HOOK_COND include/linux/netfilter.h:246 [inline] ip6_output+0x1ea/0x6d0 net/ipv6/ip6_output.c:162 dst_output include/net/dst.h:507 [inline] ip6_local_out+0x9b/0x180 net/ipv6/output_core.c:176 ip6_send_skb+0xa1/0x340 net/ipv6/ip6_output.c:1751 udp_v6_send_skb+0x429/0xe70 net/ipv6/udp.c:974 udpv6_sendmsg+0x1ebb/0x2430 net/ipv6/udp.c:1246 inet_sendmsg+0x203/0x4d0 net/ipv4/af_inet.c:770 sock_sendmsg_nosec net/socket.c:648 [inline] sock_sendmsg+0xbb/0x110 net/socket.c:658 ___sys_sendmsg+0x47a/0x840 net/socket.c:1982 __sys_sendmmsg+0x23c/0x3d0 net/socket.c:2065 C_SYSC_sendmmsg net/compat.c:742 [inline] compat_SyS_sendmmsg+0x32/0x40 net/compat.c:739 do_syscall_32_irqs_on arch/x86/entry/common.c:328 [inline] do_fast_syscall_32+0x2f1/0xa10 arch/x86/entry/common.c:390 entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137 The buggy address belongs to the object at ffff880162c94000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 36 bytes to the right of 512-byte region [ffff880162c94000, ffff880162c94200) The buggy address belongs to the page: page:ffffea00058b2500 count:1 mapcount:0 mapping: (null) index:0x0 compound_mapcount: 0 flags: 0x4000000000004080(slab|head) page dumped because: kasan: bad access detected Memory state around the buggy address: ffff880162c94100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff880162c94180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff880162c94200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff880162c94280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff880162c94300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================