RAX: ffffffffffffffda RBX: 00007f1261a87c90 RCX: 0000000000458da9 RDX: 04000000000001e6 RSI: 0000000020000c00 RDI: 0000000000000005 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1261a886d4 R13: 00000000004c60ad R14: 00000000004daaf0 R15: 0000000000000006 dccp_parse_options: DCCP(000000008696af2f): Option 32 (len=7) error=9 ================================================================== BUG: KASAN: use-after-free in ccid2_hc_tx_packet_recv+0x21ca/0x223b net/dccp/ccids/ccid2.c:600 Read of size 1 at addr ffff88806a313a14 by task syz-executor.3/22550 CPU: 0 PID: 22550 Comm: syz-executor.3 Not tainted 5.1.0+ #5 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+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:188 __kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 kasan_report+0x12/0x20 mm/kasan/common.c:614 __asan_report_load1_noabort+0x14/0x20 mm/kasan/generic_report.c:129 ccid2_hc_tx_packet_recv+0x21ca/0x223b net/dccp/ccids/ccid2.c:600 ccid_hc_tx_packet_recv net/dccp/ccid.h:192 [inline] dccp_deliver_input_to_ccids+0x202/0x280 net/dccp/input.c:186 dccp_rcv_established net/dccp/input.c:378 [inline] dccp_rcv_established+0x83/0xb0 net/dccp/input.c:368 dccp_v4_do_rcv+0x139/0x190 net/dccp/ipv4.c:659 sk_backlog_rcv include/net/sock.h:950 [inline] __release_sock+0x12e/0x3a0 net/core/sock.c:2418 release_sock+0x59/0x1c0 net/core/sock.c:2934 dccp_sendmsg+0x683/0xd00 net/dccp/proto.c:818 inet_sendmsg+0x147/0x5e0 net/ipv4/af_inet.c:802 sock_sendmsg_nosec net/socket.c:660 [inline] sock_sendmsg+0xf2/0x170 net/socket.c:671 ___sys_sendmsg+0x3e2/0x960 net/socket.c:2292 __sys_sendmmsg+0x1bf/0x4d0 net/socket.c:2387 __do_sys_sendmmsg net/socket.c:2416 [inline] __se_sys_sendmmsg net/socket.c:2413 [inline] __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2413 do_syscall_64+0x103/0x670 arch/x86/entry/common.c:298 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458da9 Code: ad b8 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 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f1261a87c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007f1261a87c90 RCX: 0000000000458da9 RDX: 04000000000001e6 RSI: 0000000020000c00 RDI: 0000000000000005 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1261a886d4 R13: 00000000004c60ad R14: 00000000004daaf0 R15: 0000000000000006 Allocated by task 22550: save_stack+0x23/0x90 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_kmalloc mm/kasan/common.c:489 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:462 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:503 __do_kmalloc_node mm/slab.c:3651 [inline] __kmalloc_node_track_caller+0x4e/0x70 mm/slab.c:3665 __kmalloc_reserve.isra.0+0x40/0xf0 net/core/skbuff.c:142 __alloc_skb+0x10b/0x5e0 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1058 [inline] dccp_send_ack+0xd6/0x360 net/dccp/output.c:580 ccid2_hc_rx_packet_recv+0x139/0x1b0 net/dccp/ccids/ccid2.c:779 ccid_hc_rx_packet_recv net/dccp/ccid.h:185 [inline] dccp_deliver_input_to_ccids+0xee/0x280 net/dccp/input.c:180 dccp_rcv_established net/dccp/input.c:378 [inline] dccp_rcv_established+0x83/0xb0 net/dccp/input.c:368 dccp_v4_do_rcv+0x139/0x190 net/dccp/ipv4.c:659 sk_backlog_rcv include/net/sock.h:950 [inline] __sk_receive_skb+0x33a/0xbe0 net/core/sock.c:528 dccp_v4_rcv+0xeaa/0x1bf1 net/dccp/ipv4.c:880 ip_protocol_deliver_rcu+0x74c/0x940 net/ipv4/ip_input.c:211 ip_local_deliver_finish+0x23b/0x390 net/ipv4/ip_input.c:238 NF_HOOK include/linux/netfilter.h:305 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] ip_local_deliver+0x1e9/0x520 net/ipv4/ip_input.c:259 dst_input include/net/dst.h:439 [inline] ip_rcv_finish+0x1e1/0x300 net/ipv4/ip_input.c:420 NF_HOOK include/linux/netfilter.h:305 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] ip_rcv+0xe8/0x3f0 net/ipv4/ip_input.c:530 __netif_receive_skb_one_core+0x18d/0x1f0 net/core/dev.c:4990 __netif_receive_skb+0x2c/0x1d0 net/core/dev.c:5104 process_backlog+0x206/0x750 net/core/dev.c:5944 napi_poll net/core/dev.c:6367 [inline] net_rx_action+0x4fa/0x1070 net/core/dev.c:6433 __do_softirq+0x266/0x95a kernel/softirq.c:293 Freed by task 22550: save_stack+0x23/0x90 mm/kasan/common.c:71 set_track mm/kasan/common.c:79 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:451 kasan_slab_free+0xe/0x10 mm/kasan/common.c:459 __cache_free mm/slab.c:3463 [inline] kfree+0xcf/0x230 mm/slab.c:3786 skb_free_head+0x93/0xb0 net/core/skbuff.c:592 skb_release_data+0x576/0x7a0 net/core/skbuff.c:612 skb_release_all+0x4d/0x60 net/core/skbuff.c:666 __kfree_skb net/core/skbuff.c:680 [inline] kfree_skb net/core/skbuff.c:698 [inline] kfree_skb+0xe8/0x390 net/core/skbuff.c:692 dccp_v4_do_rcv net/dccp/ipv4.c:694 [inline] dccp_v4_do_rcv+0x160/0x190 net/dccp/ipv4.c:654 sk_backlog_rcv include/net/sock.h:950 [inline] __release_sock+0x12e/0x3a0 net/core/sock.c:2418 release_sock+0x59/0x1c0 net/core/sock.c:2934 dccp_sendmsg+0x683/0xd00 net/dccp/proto.c:818 inet_sendmsg+0x147/0x5e0 net/ipv4/af_inet.c:802 sock_sendmsg_nosec net/socket.c:660 [inline] sock_sendmsg+0xf2/0x170 net/socket.c:671 ___sys_sendmsg+0x3e2/0x960 net/socket.c:2292 __sys_sendmmsg+0x1bf/0x4d0 net/socket.c:2387 __do_sys_sendmmsg net/socket.c:2416 [inline] __se_sys_sendmmsg net/socket.c:2413 [inline] __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2413 do_syscall_64+0x103/0x670 arch/x86/entry/common.c:298 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88806a313580 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1172 bytes inside of 2048-byte region [ffff88806a313580, ffff88806a313d80) The buggy address belongs to the page: page:ffffea0001a8c480 count:1 mapcount:0 mapping:ffff8880aa400c40 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea0002524f08 ffffea000237a608 ffff8880aa400c40 raw: 0000000000000000 ffff88806a312480 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88806a313900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88806a313980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88806a313a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88806a313a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88806a313b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================