================================================================== BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:447 [inline] BUG: KASAN: slab-out-of-bounds in skb_copy_from_linear_data_offset include/linux/skbuff.h:3676 [inline] BUG: KASAN: slab-out-of-bounds in skb_segment+0x14ba/0x37a0 net/core/skbuff.c:3996 Read of size 1428 at addr ffff888029b586d4 by task kworker/u4:6/290 CPU: 0 PID: 290 Comm: kworker/u4:6 Not tainted 5.11.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: krdsd rds_send_worker Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:230 __kasan_report mm/kasan/report.c:396 [inline] kasan_report.cold+0x79/0xd5 mm/kasan/report.c:413 check_memory_region_inline mm/kasan/generic.c:179 [inline] check_memory_region+0x13d/0x180 mm/kasan/generic.c:185 memcpy+0x20/0x60 mm/kasan/shadow.c:64 memcpy include/linux/string.h:447 [inline] skb_copy_from_linear_data_offset include/linux/skbuff.h:3676 [inline] skb_segment+0x14ba/0x37a0 net/core/skbuff.c:3996 tcp_gso_segment+0x33d/0x17e0 net/ipv4/tcp_offload.c:98 tcp6_gso_segment net/ipv6/tcpv6_offload.c:65 [inline] tcp6_gso_segment+0x1a0/0x460 net/ipv6/tcpv6_offload.c:41 ipv6_gso_segment+0x48d/0xf50 net/ipv6/ip6_offload.c:115 skb_mac_gso_segment+0x26e/0x530 net/core/dev.c:3326 __skb_gso_segment+0x330/0x6e0 net/core/dev.c:3399 skb_gso_segment include/linux/netdevice.h:4708 [inline] cake_enqueue+0x2808/0x39f0 net/sched/sch_cake.c:1742 __dev_xmit_skb net/core/dev.c:3807 [inline] __dev_queue_xmit+0x1913/0x2dd0 net/core/dev.c:4119 neigh_resolve_output net/core/neighbour.c:1490 [inline] neigh_resolve_output+0x4d8/0x7e0 net/core/neighbour.c:1470 neigh_output include/net/neighbour.h:510 [inline] ip6_finish_output2+0x6b8/0x16c0 net/ipv6/ip6_output.c:117 __ip6_finish_output net/ipv6/ip6_output.c:182 [inline] __ip6_finish_output+0x4c1/0xe10 net/ipv6/ip6_output.c:161 ip6_finish_output+0x35/0x200 net/ipv6/ip6_output.c:192 NF_HOOK_COND include/linux/netfilter.h:290 [inline] ip6_output+0x1db/0x520 net/ipv6/ip6_output.c:215 dst_output include/net/dst.h:441 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] NF_HOOK include/linux/netfilter.h:295 [inline] ip6_xmit+0x127e/0x1eb0 net/ipv6/ip6_output.c:319 inet6_csk_xmit+0x358/0x630 net/ipv6/inet6_connection_sock.c:135 __tcp_transmit_skb+0x188c/0x38f0 net/ipv4/tcp_output.c:1405 tcp_transmit_skb net/ipv4/tcp_output.c:1423 [inline] tcp_write_xmit+0xde7/0x6140 net/ipv4/tcp_output.c:2689 __tcp_push_pending_frames+0xaa/0x390 net/ipv4/tcp_output.c:2869 tcp_push+0x446/0x6c0 net/ipv4/tcp.c:737 do_tcp_sendpages+0x9f3/0xdb0 net/ipv4/tcp.c:1106 tcp_sendpage_locked net/ipv4/tcp.c:1132 [inline] tcp_sendpage_locked net/ipv4/tcp.c:1124 [inline] tcp_sendpage+0x80/0xd0 net/ipv4/tcp.c:1142 inet_sendpage+0xd0/0x140 net/ipv4/af_inet.c:831 rds_tcp_xmit+0x2d0/0xa60 net/rds/tcp_send.c:118 rds_send_xmit+0x109b/0x2530 net/rds/send.c:367 rds_send_worker+0x92/0x2e0 net/rds/threads.c:200 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Allocated by task 290: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:401 [inline] ____kasan_kmalloc.constprop.0+0x82/0xa0 mm/kasan/common.c:429 kasan_slab_alloc include/linux/kasan.h:205 [inline] slab_post_alloc_hook mm/slab.h:512 [inline] slab_alloc_node mm/slub.c:2891 [inline] __kmalloc_node_track_caller+0x1e0/0x3f0 mm/slub.c:4495 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0xae/0x5a0 net/core/skbuff.c:210 alloc_skb_fclone include/linux/skbuff.h:1150 [inline] sk_stream_alloc_skb+0x109/0xc30 net/ipv4/tcp.c:888 tcp_sendmsg_locked+0xc00/0x2e40 net/ipv4/tcp.c:1310 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1459 inet6_sendmsg+0x99/0xe0 net/ipv6/af_inet6.c:638 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 rds_tcp_sendmsg+0xad/0xf0 net/rds/tcp_send.c:66 rds_tcp_xmit+0x6ba/0xa60 net/rds/tcp_send.c:104 rds_send_xmit+0x109b/0x2530 net/rds/send.c:367 rds_send_worker+0x92/0x2e0 net/rds/threads.c:200 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 The buggy address belongs to the object at ffff888029b58000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 724 bytes to the right of 1024-byte region [ffff888029b58000, ffff888029b58400) The buggy address belongs to the page: page:000000003c3b5e34 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x29b58 head:000000003c3b5e34 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head) raw: 00fff00000010200 0000000000000000 0000000200000001 ffff888010041140 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888029b58580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888029b58600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888029b58680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888029b58700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888029b58780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================