RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fcf992256d4 R13: 00000000004c7f9d R14: 00000000004de3c8 R15: 0000000000000007 dccp_parse_options: DCCP(ffff8880a131e000): Option 32 (len=7) error=9 ================================================================== BUG: KASAN: use-after-free in ccid2_hc_tx_packet_recv+0x1cf3/0x1fa4 net/dccp/ccids/ccid2.c:599 Read of size 1 at addr ffff88805a26901d by task syz-executor.2/10788 CPU: 1 PID: 10788 Comm: syz-executor.2 Not tainted 4.14.152 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x138/0x197 lib/dump_stack.c:53 print_address_description.cold+0x7c/0x1dc mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report mm/kasan/report.c:409 [inline] kasan_report.cold+0xa9/0x2af mm/kasan/report.c:393 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:427 ccid2_hc_tx_packet_recv+0x1cf3/0x1fa4 net/dccp/ccids/ccid2.c:599 ccid_hc_tx_packet_recv net/dccp/ccid.h:192 [inline] dccp_deliver_input_to_ccids+0x1d5/0x250 net/dccp/input.c:186 dccp_rcv_established net/dccp/input.c:378 [inline] dccp_rcv_established+0x6b/0xb0 net/dccp/input.c:368 dccp_v4_do_rcv+0x122/0x170 net/dccp/ipv4.c:656 sk_backlog_rcv include/net/sock.h:912 [inline] __release_sock+0x12d/0x350 net/core/sock.c:2264 release_sock+0x59/0x1b0 net/core/sock.c:2779 dccp_sendmsg+0x57e/0x950 net/dccp/proto.c:813 inet_sendmsg+0x122/0x500 net/ipv4/af_inet.c:762 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xce/0x110 net/socket.c:656 ___sys_sendmsg+0x349/0x840 net/socket.c:2062 __sys_sendmmsg+0x152/0x3a0 net/socket.c:2152 SYSC_sendmmsg net/socket.c:2183 [inline] SyS_sendmmsg+0x35/0x60 net/socket.c:2178 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45a219 RSP: 002b:00007fcf99224c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007fcf99224c90 RCX: 000000000045a219 RDX: 04000000000001e6 RSI: 0000000020000c00 RDI: 0000000000000006 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fcf992256d4 R13: 00000000004c7f9d R14: 00000000004de3c8 R15: 0000000000000007 Allocated by task 10788: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x45/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc mm/kasan/kasan.c:551 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:529 __do_kmalloc_node mm/slab.c:3682 [inline] __kmalloc_node_track_caller+0x51/0x80 mm/slab.c:3696 __kmalloc_reserve.isra.0+0x40/0xe0 net/core/skbuff.c:137 __alloc_skb+0xcf/0x500 net/core/skbuff.c:205 alloc_skb include/linux/skbuff.h:980 [inline] dccp_send_ack+0xc7/0x330 net/dccp/output.c:580 ccid2_hc_rx_packet_recv+0x10e/0x180 net/dccp/ccids/ccid2.c:778 ccid_hc_rx_packet_recv net/dccp/ccid.h:185 [inline] dccp_deliver_input_to_ccids+0xdd/0x250 net/dccp/input.c:180 dccp_rcv_established net/dccp/input.c:378 [inline] dccp_rcv_established+0x6b/0xb0 net/dccp/input.c:368 dccp_v4_do_rcv+0x122/0x170 net/dccp/ipv4.c:656 sk_backlog_rcv include/net/sock.h:912 [inline] __sk_receive_skb+0x226/0x950 net/core/sock.c:511 dccp_v4_rcv+0xd47/0x1903 net/dccp/ipv4.c:877 ip_local_deliver_finish+0x25e/0xad0 net/ipv4/ip_input.c:216 NF_HOOK include/linux/netfilter.h:250 [inline] NF_HOOK include/linux/netfilter.h:244 [inline] ip_local_deliver+0x1c3/0x4a0 net/ipv4/ip_input.c:257 dst_input include/net/dst.h:468 [inline] ip_rcv_finish+0x7be/0x1a50 net/ipv4/ip_input.c:396 NF_HOOK include/linux/netfilter.h:250 [inline] NF_HOOK include/linux/netfilter.h:244 [inline] ip_rcv+0xaa5/0x112b net/ipv4/ip_input.c:493 __netif_receive_skb_core+0x1eae/0x2ca0 net/core/dev.c:4477 __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4515 process_backlog+0x21f/0x730 net/core/dev.c:5197 napi_poll net/core/dev.c:5598 [inline] net_rx_action+0x490/0xf80 net/core/dev.c:5664 __do_softirq+0x244/0x9a0 kernel/softirq.c:288 Freed by task 10788: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x45/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xcc/0x270 mm/slab.c:3815 skb_free_head+0x8b/0xb0 net/core/skbuff.c:554 skb_release_data+0x4af/0x700 net/core/skbuff.c:574 skb_release_all+0x4d/0x60 net/core/skbuff.c:631 __kfree_skb net/core/skbuff.c:645 [inline] kfree_skb+0xb5/0x340 net/core/skbuff.c:663 dccp_v4_do_rcv net/dccp/ipv4.c:691 [inline] dccp_v4_do_rcv+0x13e/0x170 net/dccp/ipv4.c:651 sk_backlog_rcv include/net/sock.h:912 [inline] __release_sock+0x12d/0x350 net/core/sock.c:2264 release_sock+0x59/0x1b0 net/core/sock.c:2779 dccp_sendmsg+0x57e/0x950 net/dccp/proto.c:813 inet_sendmsg+0x122/0x500 net/ipv4/af_inet.c:762 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xce/0x110 net/socket.c:656 ___sys_sendmsg+0x349/0x840 net/socket.c:2062 __sys_sendmmsg+0x152/0x3a0 net/socket.c:2152 SYSC_sendmmsg net/socket.c:2183 [inline] SyS_sendmmsg+0x35/0x60 net/socket.c:2178 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 The buggy address belongs to the object at ffff88805a268b80 which belongs to the cache kmalloc-2048 of size 2048 The buggy address is located 1181 bytes inside of 2048-byte region [ffff88805a268b80, ffff88805a269380) The buggy address belongs to the page: page:ffffea0001689a00 count:1 mapcount:0 mapping:ffff88805a268300 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000008100(slab|head) raw: 01fffc0000008100 ffff88805a268300 0000000000000000 0000000100000003 raw: ffffea00016893a0 ffffea0001673e20 ffff8880aa800c40 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88805a268f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805a268f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88805a269000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805a269080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805a269100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================