================================================================== BUG: KASAN: use-after-free in __list_add_valid+0x9a/0xa0 lib/list_debug.c:26 Read of size 8 at addr ffff8880a7bbf1e0 by task syz-executor.1/18472 CPU: 1 PID: 18472 Comm: syz-executor.1 Not tainted 5.6.0-rc3-syzkaller #0 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+0x197/0x210 lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374 __kasan_report.cold+0x1b/0x32 mm/kasan/report.c:506 kasan_report+0x12/0x20 mm/kasan/common.c:641 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135 __list_add_valid+0x9a/0xa0 lib/list_debug.c:26 __list_add include/linux/list.h:67 [inline] list_add_tail include/linux/list.h:100 [inline] cma_listen_on_all drivers/infiniband/core/cma.c:2512 [inline] rdma_listen+0x6b7/0x970 drivers/infiniband/core/cma.c:3622 ucma_listen+0x14d/0x1c0 drivers/infiniband/core/ucma.c:1092 ucma_write+0x2d7/0x3c0 drivers/infiniband/core/ucma.c:1684 __vfs_write+0x8a/0x110 fs/read_write.c:494 vfs_write+0x268/0x5d0 fs/read_write.c:558 ksys_write+0x220/0x290 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write fs/read_write.c:620 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:620 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c479 Code: ad b6 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 b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fd8c32c7c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fd8c32c86d4 RCX: 000000000045c479 RDX: 0000000000000010 RSI: 0000000020000280 RDI: 0000000000000005 RBP: 000000000076c060 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000cbe R14: 00000000004cea34 R15: 000000000076c06c Allocated by task 16934: save_stack+0x23/0x90 mm/kasan/common.c:72 set_track mm/kasan/common.c:80 [inline] __kasan_kmalloc mm/kasan/common.c:515 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:488 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:529 __do_kmalloc_node mm/slab.c:3616 [inline] __kmalloc_node_track_caller+0x4e/0x70 mm/slab.c:3630 __kmalloc_reserve.isra.0+0x40/0xf0 net/core/skbuff.c:142 __alloc_skb+0x10b/0x5e0 net/core/skbuff.c:210 alloc_skb_fclone include/linux/skbuff.h:1131 [inline] sk_stream_alloc_skb net/ipv4/tcp.c:876 [inline] sk_stream_alloc_skb+0x113/0xc90 net/ipv4/tcp.c:853 tcp_connect+0x1071/0x4600 net/ipv4/tcp_output.c:3644 tcp_v6_connect+0x153c/0x2150 net/ipv6/tcp_ipv6.c:334 __inet_stream_connect+0x85c/0xec0 net/ipv4/af_inet.c:655 inet_stream_connect+0x58/0xa0 net/ipv4/af_inet.c:719 rds_tcp_conn_path_connect+0x620/0x880 net/rds/tcp_connect.c:172 rds_connect_worker+0x1b6/0x2d0 net/rds/threads.c:176 process_one_work+0xa05/0x17a0 kernel/workqueue.c:2264 worker_thread+0x98/0xe40 kernel/workqueue.c:2410 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Freed by task 16934: save_stack+0x23/0x90 mm/kasan/common.c:72 set_track mm/kasan/common.c:80 [inline] kasan_set_free_info mm/kasan/common.c:337 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:476 kasan_slab_free+0xe/0x10 mm/kasan/common.c:485 __cache_free mm/slab.c:3426 [inline] kfree+0x10a/0x2c0 mm/slab.c:3757 skb_free_head+0x93/0xb0 net/core/skbuff.c:590 skb_release_data+0x43c/0x8b0 net/core/skbuff.c:610 skb_release_all+0x4d/0x60 net/core/skbuff.c:664 __kfree_skb+0x16/0x30 net/core/skbuff.c:678 sk_wmem_free_skb include/net/sock.h:1497 [inline] tcp_rtx_queue_unlink_and_free include/net/tcp.h:1842 [inline] tcp_clean_rtx_queue net/ipv4/tcp_input.c:3169 [inline] tcp_ack+0x1ccf/0x5d20 net/ipv4/tcp_input.c:3696 tcp_rcv_synsent_state_process net/ipv4/tcp_input.c:5962 [inline] tcp_rcv_state_process+0x163e/0x52ca net/ipv4/tcp_input.c:6200 tcp_v6_do_rcv+0x7e0/0x12d0 net/ipv6/tcp_ipv6.c:1463 sk_backlog_rcv include/net/sock.h:963 [inline] __release_sock+0x129/0x390 net/core/sock.c:2437 release_sock+0x59/0x1c0 net/core/sock.c:2953 inet_stream_connect+0x7b/0xa0 net/ipv4/af_inet.c:720 rds_tcp_conn_path_connect+0x620/0x880 net/rds/tcp_connect.c:172 rds_connect_worker+0x1b6/0x2d0 net/rds/threads.c:176 process_one_work+0xa05/0x17a0 kernel/workqueue.c:2264 worker_thread+0x98/0xe40 kernel/workqueue.c:2410 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff8880a7bbf000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 480 bytes inside of 1024-byte region [ffff8880a7bbf000, ffff8880a7bbf400) The buggy address belongs to the page: page:ffffea00029eefc0 refcount:1 mapcount:0 mapping:ffff8880aa400c40 index:0x0 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea0001069b08 ffffea00010e2a08 ffff8880aa400c40 raw: 0000000000000000 ffff8880a7bbf000 0000000100000002 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a7bbf080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a7bbf100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880a7bbf180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a7bbf200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a7bbf280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================