================================================================== BUG: KASAN: slab-out-of-bounds in skb_headlen include/linux/skbuff.h:1898 [inline] BUG: KASAN: slab-out-of-bounds in pskb_may_pull include/linux/skbuff.h:2112 [inline] BUG: KASAN: slab-out-of-bounds in skb_ensure_writable+0x290/0x2e0 net/core/skbuff.c:5019 Read of size 4 at addr ffff8801a1773c38 by task syz-executor2/27499 CPU: 1 PID: 27499 Comm: syz-executor2 Not tainted 4.14.78+ #23 FAT-fs (loop2): Unrecognized mount option "obj_role=" or missing value Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xb9/0x11b lib/dump_stack.c:53 print_address_description+0x60/0x22b mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report.cold.6+0x11b/0x2dd mm/kasan/report.c:409 skb_headlen include/linux/skbuff.h:1898 [inline] pskb_may_pull include/linux/skbuff.h:2112 [inline] skb_ensure_writable+0x290/0x2e0 net/core/skbuff.c:5019 __bpf_try_make_writable net/core/filter.c:1403 [inline] bpf_try_make_writable net/core/filter.c:1409 [inline] ____bpf_l3_csum_replace net/core/filter.c:1530 [inline] bpf_l3_csum_replace+0x5f/0x340 net/core/filter.c:1521 ___bpf_prog_run+0x248e/0x5c70 kernel/bpf/core.c:1012 SELinux: policydb table sizes (-1744817152,-1685579676) do not match mine (6,7) SELinux: failed to load policy SELinux: policydb table sizes (-1744817152,-1685579676) do not match mine (6,7) SELinux: failed to load policy Allocated by task 27472: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc.part.1+0x4f/0xd0 mm/kasan/kasan.c:551 slab_post_alloc_hook mm/slab.h:442 [inline] slab_alloc_node mm/slub.c:2723 [inline] slab_alloc mm/slub.c:2731 [inline] kmem_cache_alloc+0xe4/0x2b0 mm/slub.c:2736 __build_skb+0x30/0x2c0 net/core/skbuff.c:281 __napi_alloc_skb+0x1ca/0x300 net/core/skbuff.c:482 napi_alloc_skb include/linux/skbuff.h:2655 [inline] page_to_skb.isra.18+0xa3/0x690 drivers/net/virtio_net.c:321 receive_mergeable drivers/net/virtio_net.c:714 [inline] receive_buf+0x1721/0x42c0 drivers/net/virtio_net.c:819 virtnet_receive drivers/net/virtio_net.c:1093 [inline] virtnet_poll+0x2af/0x910 drivers/net/virtio_net.c:1174 napi_poll net/core/dev.c:5591 [inline] net_rx_action+0x371/0xce0 net/core/dev.c:5657 __do_softirq+0x215/0x997 kernel/softirq.c:288 Freed by task 27472: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0xac/0x190 mm/kasan/kasan.c:524 slab_free_hook mm/slub.c:1389 [inline] slab_free_freelist_hook mm/slub.c:1410 [inline] slab_free mm/slub.c:2966 [inline] kmem_cache_free+0x12d/0x350 mm/slub.c:2988 kfree_skbmem+0x9e/0x100 net/core/skbuff.c:582 tcp_rcv_established+0xd8d/0x1660 net/ipv4/tcp_input.c:5472 tcp_v4_do_rcv+0x55f/0x6f0 net/ipv4/tcp_ipv4.c:1466 tcp_v4_rcv+0x26ca/0x3240 net/ipv4/tcp_ipv4.c:1747 ip_local_deliver_finish+0x3f1/0xaa0 net/ipv4/ip_input.c:216 NF_HOOK include/linux/netfilter.h:250 [inline] ip_local_deliver+0x374/0x450 net/ipv4/ip_input.c:257 dst_input include/net/dst.h:465 [inline] ip_rcv_finish+0x5cc/0x1490 net/ipv4/ip_input.c:397 NF_HOOK include/linux/netfilter.h:250 [inline] ip_rcv+0xa19/0x1028 net/ipv4/ip_input.c:493 __netif_receive_skb_core+0x149d/0x2d10 net/core/dev.c:4477 __netif_receive_skb+0x58/0x1f0 net/core/dev.c:4515 netif_receive_skb_internal+0xfc/0x5e0 net/core/dev.c:4588 napi_skb_finish net/core/dev.c:4949 [inline] napi_gro_receive+0x20e/0x410 net/core/dev.c:4980 receive_buf+0xa55/0x42c0 drivers/net/virtio_net.c:847 virtnet_receive drivers/net/virtio_net.c:1093 [inline] virtnet_poll+0x2af/0x910 drivers/net/virtio_net.c:1174 napi_poll net/core/dev.c:5591 [inline] net_rx_action+0x371/0xce0 net/core/dev.c:5657 __do_softirq+0x215/0x997 kernel/softirq.c:288 The buggy address belongs to the object at ffff8801a1773b40 which belongs to the cache skbuff_head_cache of size 224 The buggy address is located 24 bytes to the right of 224-byte region [ffff8801a1773b40, ffff8801a1773c20) The buggy address belongs to the page: page:ffffea000685dcc0 count:1 mapcount:0 mapping: (null) index:0x0 flags: 0x4000000000000100(slab) raw: 4000000000000100 0000000000000000 0000000000000000 00000001800c000c raw: dead000000000100 dead000000000200 ffff8801dab70200 0000000000000000 binder: 27492:27500 transaction failed 29189/-22, size 0-0 line 3012 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801a1773b00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff8801a1773b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8801a1773c00: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc ^ EXT4-fs (loop4): Unrecognized mount option "e$A!3n ý/%(jgvrvh