================================================================== BUG: KASAN: slab-out-of-bounds in atomic_read include/asm-generic/atomic-instrumented.h:21 [inline] BUG: KASAN: slab-out-of-bounds in refcount_read include/linux/refcount.h:42 [inline] BUG: KASAN: slab-out-of-bounds in check_net include/net/net_namespace.h:236 [inline] BUG: KASAN: slab-out-of-bounds in rds_destroy_pending net/rds/rds.h:897 [inline] BUG: KASAN: slab-out-of-bounds in rds_cong_queue_updates+0x255/0x590 net/rds/cong.c:226 Read of size 4 at addr ffff880191200104 by task syz-executor6/2545 CPU: 0 PID: 2545 Comm: syz-executor6 Not tainted 4.17.0+ #84 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1b9/0x294 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267 kasan_check_read+0x11/0x20 mm/kasan/kasan.c:272 atomic_read include/asm-generic/atomic-instrumented.h:21 [inline] refcount_read include/linux/refcount.h:42 [inline] check_net include/net/net_namespace.h:236 [inline] rds_destroy_pending net/rds/rds.h:897 [inline] rds_cong_queue_updates+0x255/0x590 net/rds/cong.c:226 rds_recv_rcvbuf_delta.part.3+0x2b9/0x350 net/rds/recv.c:118 rds_recv_rcvbuf_delta net/rds/recv.c:377 [inline] rds_recv_incoming+0x83f/0x1300 net/rds/recv.c:377 rds_loop_xmit+0x16a/0x340 net/rds/loop.c:82 rds_send_xmit+0x131b/0x2990 net/rds/send.c:355 rds_sendmsg+0x228d/0x2a30 net/rds/send.c:1243 sock_sendmsg_nosec net/socket.c:645 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:655 __sys_sendto+0x3d7/0x670 net/socket.c:1833 __do_sys_sendto net/socket.c:1845 [inline] __se_sys_sendto net/socket.c:1841 [inline] __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1841 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455b29 Code: 1d ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f9a2c69bc68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f9a2c69c6d4 RCX: 0000000000455b29 RDX: 0000000000000481 RSI: 0000000020000000 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 000000002069affb R09: 0000000000000010 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004c0eac R14: 00000000004d0c28 R15: 0000000000000000 Allocated by task 1625: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 __do_kmalloc_node mm/slab.c:3682 [inline] __kmalloc_node_track_caller+0x47/0x70 mm/slab.c:3696 __kmalloc_reserve.isra.40+0x3a/0xe0 net/core/skbuff.c:137 __alloc_skb+0x14d/0x780 net/core/skbuff.c:205 alloc_skb include/linux/skbuff.h:987 [inline] sctp_packet_transmit+0x45e/0x3ba0 net/sctp/output.c:585 sctp_packet_singleton net/sctp/outqueue.c:791 [inline] sctp_outq_flush_ctrl.constprop.12+0x78d/0xe60 net/sctp/outqueue.c:922 sctp_outq_flush+0x2ef/0x3430 net/sctp/outqueue.c:1203 sctp_outq_uncork+0x6a/0x80 net/sctp/outqueue.c:776 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1349 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1220 [inline] sctp_do_sm+0x4f32/0x7160 net/sctp/sm_sideeffect.c:1191 sctp_endpoint_bh_rcv+0x45d/0x950 net/sctp/endpointola.c:456 sctp_inq_push+0x263/0x320 net/sctp/inqueue.c:95 sctp_rcv+0x2cf6/0x3a60 net/sctp/input.c:267 sctp6_rcv+0x15/0x30 net/sctp/ipv6.c:1045 ip6_input_finish+0x3ff/0x1a30 net/ipv6/ip6_input.c:284 NF_HOOK include/linux/netfilter.h:287 [inline] ip6_input+0xe1/0x5e0 net/ipv6/ip6_input.c:327 dst_input include/net/dst.h:450 [inline] ip6_rcv_finish+0x29c/0xa10 net/ipv6/ip6_input.c:71 NF_HOOK include/linux/netfilter.h:287 [inline] ipv6_rcv+0xeb8/0x2040 net/ipv6/ip6_input.c:208 __netif_receive_skb_core+0x2468/0x3650 net/core/dev.c:4628 __netif_receive_skb+0x2c/0x1e0 net/core/dev.c:4693 process_backlog+0x219/0x760 net/core/dev.c:5373 napi_poll net/core/dev.c:5771 [inline] net_rx_action+0x7b7/0x1930 net/core/dev.c:5837 __do_softirq+0x2e0/0xaf5 kernel/softirq.c:284 Freed by task 1625: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x260 mm/slab.c:3813 skb_free_head+0x99/0xc0 net/core/skbuff.c:550 skb_release_data+0x690/0x860 net/core/skbuff.c:570 skb_release_all+0x4a/0x60 net/core/skbuff.c:627 __kfree_skb net/core/skbuff.c:641 [inline] consume_skb+0x18b/0x550 net/core/skbuff.c:701 ip6_fragment+0x1f60/0x3910 net/ipv6/ip6_output.c:852 ip6_finish_output+0x621/0xbc0 net/ipv6/ip6_output.c:152 NF_HOOK_COND include/linux/netfilter.h:276 [inline] ip6_output+0x227/0x9b0 net/ipv6/ip6_output.c:171 dst_output include/net/dst.h:444 [inline] NF_HOOK include/linux/netfilter.h:287 [inline] ip6_xmit+0xf51/0x23f0 net/ipv6/ip6_output.c:277 sctp_v6_xmit+0x4a5/0x6b0 net/sctp/ipv6.c:225 sctp_packet_transmit+0x26f6/0x3ba0 net/sctp/output.c:642 sctp_packet_singleton net/sctp/outqueue.c:791 [inline] sctp_outq_flush_ctrl.constprop.12+0x78d/0xe60 net/sctp/outqueue.c:922 sctp_outq_flush+0x2ef/0x3430 net/sctp/outqueue.c:1203 sctp_outq_uncork+0x6a/0x80 net/sctp/outqueue.c:776 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1349 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1220 [inline] sctp_do_sm+0x4f32/0x7160 net/sctp/sm_sideeffect.c:1191 sctp_endpoint_bh_rcv+0x45d/0x950 net/sctp/endpointola.c:456 sctp_inq_push+0x263/0x320 net/sctp/inqueue.c:95 sctp_rcv+0x2cf6/0x3a60 net/sctp/input.c:267 sctp6_rcv+0x15/0x30 net/sctp/ipv6.c:1045 ip6_input_finish+0x3ff/0x1a30 net/ipv6/ip6_input.c:284 NF_HOOK include/linux/netfilter.h:287 [inline] ip6_input+0xe1/0x5e0 net/ipv6/ip6_input.c:327 dst_input include/net/dst.h:450 [inline] ip6_rcv_finish+0x29c/0xa10 net/ipv6/ip6_input.c:71 NF_HOOK include/linux/netfilter.h:287 [inline] ipv6_rcv+0xeb8/0x2040 net/ipv6/ip6_input.c:208 __netif_receive_skb_core+0x2468/0x3650 net/core/dev.c:4628 __netif_receive_skb+0x2c/0x1e0 net/core/dev.c:4693 process_backlog+0x219/0x760 net/core/dev.c:5373 napi_poll net/core/dev.c:5771 [inline] net_rx_action+0x7b7/0x1930 net/core/dev.c:5837 __do_softirq+0x2e0/0xaf5 kernel/softirq.c:284 The buggy address belongs to the object at ffff880191201100 which belongs to the cache kmalloc-8192 of size 8192 The buggy address is located 4092 bytes to the left of 8192-byte region [ffff880191201100, ffff880191203100) The buggy address belongs to the page: page:ffffea0006448000 count:1 mapcount:0 mapping:ffff8801da802080 index:0xffff880191201100 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffffea0006a01208 ffffea0006ccc308 ffff8801da802080 raw: ffff880191201100 ffff880191201100 0000000100000000 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff880191200000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff880191200080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff880191200100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff880191200180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff880191200200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================