================================================================== BUG: KASAN: use-after-free in memcmp+0xe3/0x160 lib/string.c:861 Read of size 1 at addr ffff88019a726cb0 by task syz-executor0/21994 CPU: 1 PID: 21994 Comm: syz-executor0 Not tainted 4.19.0-rc2+ #229 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+0x1c4/0x2b4 lib/dump_stack.c:113 print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.9+0x242/0x309 mm/kasan/report.c:412 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report.c:430 memcmp+0xe3/0x160 lib/string.c:861 memcmp include/linux/string.h:386 [inline] rhashtable_compare include/linux/rhashtable.h:462 [inline] __rhashtable_lookup.isra.8.constprop.20+0x73a/0xd00 include/linux/rhashtable.h:484 rhashtable_lookup include/linux/rhashtable.h:516 [inline] rhashtable_lookup_fast include/linux/rhashtable.h:542 [inline] rds_add_bound net/rds/bind.c:117 [inline] rds_bind+0x7d2/0x1520 net/rds/bind.c:238 __sys_bind+0x331/0x440 net/socket.c:1481 __do_sys_bind net/socket.c:1492 [inline] __se_sys_bind net/socket.c:1490 [inline] __x64_sys_bind+0x73/0xb0 net/socket.c:1490 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457099 Code: fd b4 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 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ff0d58c2c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000031 RAX: ffffffffffffffda RBX: 00007ff0d58c36d4 RCX: 0000000000457099 RDX: 0000000000000010 RSI: 0000000020000840 RDI: 0000000000000008 RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004cb698 R14: 00000000004c311c R15: 0000000000000000 Allocated by task 21978: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 kmem_cache_alloc+0x12e/0x730 mm/slab.c:3554 sk_prot_alloc+0x69/0x2e0 net/core/sock.c:1462 sk_alloc+0x10d/0x1690 net/core/sock.c:1522 rds_create+0x14f/0x740 net/rds/af_rds.c:666 __sock_create+0x536/0x930 net/socket.c:1275 sock_create net/socket.c:1315 [inline] __sys_socket+0x106/0x260 net/socket.c:1345 __do_sys_socket net/socket.c:1354 [inline] __se_sys_socket net/socket.c:1352 [inline] __x64_sys_socket+0x73/0xb0 net/socket.c:1352 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 21977: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kmem_cache_free+0x83/0x290 mm/slab.c:3756 sk_prot_free net/core/sock.c:1503 [inline] __sk_destruct+0x766/0xbd0 net/core/sock.c:1587 sk_destruct+0x78/0x90 net/core/sock.c:1595 __sk_free+0xcf/0x300 net/core/sock.c:1606 sk_free+0x42/0x50 net/core/sock.c:1617 sock_put include/net/sock.h:1691 [inline] rds_release+0x3e8/0x570 net/rds/af_rds.c:91 __sock_release+0xd7/0x250 net/socket.c:579 sock_close+0x19/0x20 net/socket.c:1139 __fput+0x385/0xa30 fs/file_table.c:278 ____fput+0x15/0x20 fs/file_table.c:309 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88019a726840 which belongs to the cache RDS(81:syz5) of size 1608 The buggy address is located 1136 bytes inside of 1608-byte region [ffff88019a726840, ffff88019a726e88) The buggy address belongs to the page: page:ffffea000669c980 count:1 mapcount:0 mapping:ffff8801b8eb4980 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea00068a8a08 ffff8801ba37a748 ffff8801b8eb4980 raw: 0000000000000000 ffff88019a726140 0000000100000002 ffff8801c7c9e540 page dumped because: kasan: bad access detected page->mem_cgroup:ffff8801c7c9e540 Memory state around the buggy address: ffff88019a726b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88019a726c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88019a726c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88019a726d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88019a726d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================