================================================================== BUG: KASAN: use-after-free in atomic_read include/asm-generic/atomic-instrumented.h:21 [inline] BUG: KASAN: use-after-free in refcount_read include/linux/refcount.h:42 [inline] BUG: KASAN: use-after-free in check_net include/net/net_namespace.h:236 [inline] BUG: KASAN: use-after-free in rds_destroy_pending net/rds/rds.h:897 [inline] BUG: KASAN: use-after-free in rds_cong_queue_updates+0x255/0x590 net/rds/cong.c:226 Read of size 4 at addr ffff88018cbb02c4 by task syz-executor7/11105 CPU: 0 PID: 11105 Comm: syz-executor7 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:00007f0450b7cc68 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f0450b7d6d4 RCX: 0000000000455b29 RDX: 0000000000000481 RSI: 0000000020000000 RDI: 0000000000000014 RBP: 000000000072bea0 R08: 000000002069affb R09: 0000000000000010 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004c0f7f R14: 00000000004d0e70 R15: 0000000000000000 Allocated by task 6651: 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 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 kmem_cache_alloc+0x12e/0x760 mm/slab.c:3554 getname_flags+0xd0/0x5a0 fs/namei.c:140 user_path_at_empty+0x2d/0x50 fs/namei.c:2555 do_readlinkat+0x143/0x3e0 fs/stat.c:394 __do_sys_readlink fs/stat.c:427 [inline] __se_sys_readlink fs/stat.c:424 [inline] __x64_sys_readlink+0x78/0xb0 fs/stat.c:424 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 6651: 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] kmem_cache_free+0x86/0x2d0 mm/slab.c:3756 putname+0xf2/0x130 fs/namei.c:261 filename_lookup+0x38b/0x4f0 fs/namei.c:2330 user_path_at_empty+0x40/0x50 fs/namei.c:2555 do_readlinkat+0x143/0x3e0 fs/stat.c:394 __do_sys_readlink fs/stat.c:427 [inline] __se_sys_readlink fs/stat.c:424 [inline] __x64_sys_readlink+0x78/0xb0 fs/stat.c:424 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88018cbb0d80 which belongs to the cache names_cache of size 4096 The buggy address is located 2748 bytes to the left of 4096-byte region [ffff88018cbb0d80, ffff88018cbb1d80) The buggy address belongs to the page: page:ffffea000632ec00 count:1 mapcount:0 mapping:ffff8801da986dc0 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffffea0006b7cf88 ffffea000632ec88 ffff8801da986dc0 raw: 0000000000000000 ffff88018cbb0d80 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88018cbb0180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88018cbb0200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88018cbb0280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88018cbb0300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88018cbb0380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================