================================================================== 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:43 [inline] BUG: KASAN: use-after-free in check_net include/net/net_namespace.h:254 [inline] BUG: KASAN: use-after-free in rds_destroy_pending net/rds/rds.h:951 [inline] BUG: KASAN: use-after-free in rds_cong_queue_updates+0x209/0x4d0 net/rds/cong.c:229 Read of size 4 at addr ffff888090e30344 by task syz-executor.3/12798 CPU: 0 PID: 12798 Comm: syz-executor.3 Not tainted 5.0.0-rc7+ #95 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:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x123/0x190 mm/kasan/generic.c:191 kasan_check_read+0x11/0x20 mm/kasan/common.c:100 atomic_read include/asm-generic/atomic-instrumented.h:21 [inline] refcount_read include/linux/refcount.h:43 [inline] check_net include/net/net_namespace.h:254 [inline] rds_destroy_pending net/rds/rds.h:951 [inline] rds_cong_queue_updates+0x209/0x4d0 net/rds/cong.c:229 rds_recv_rcvbuf_delta.part.0+0x34f/0x3f0 net/rds/recv.c:118 rds_recv_rcvbuf_delta net/rds/recv.c:379 [inline] rds_recv_incoming+0x789/0x11f0 net/rds/recv.c:379 rds_loop_xmit+0xf3/0x2a0 net/rds/loop.c:96 rds_send_xmit+0x1113/0x2560 net/rds/send.c:355 rds_sendmsg+0x29b4/0x3540 net/rds/send.c:1369 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:632 __sys_sendto+0x262/0x380 net/socket.c:1809 __do_sys_sendto net/socket.c:1821 [inline] __se_sys_sendto net/socket.c:1817 [inline] __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1817 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457e29 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:00007f1b8a6b2c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000457e29 RDX: 0000000000000481 RSI: 0000000020000a00 RDI: 0000000000000003 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1b8a6b36d4 R13: 00000000004c5551 R14: 00000000004d9488 R15: 00000000ffffffff Allocated by task 12669: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_kmalloc mm/kasan/common.c:495 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:468 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:503 slab_post_alloc_hook mm/slab.h:440 [inline] slab_alloc mm/slab.c:3388 [inline] kmem_cache_alloc+0x11a/0x6f0 mm/slab.c:3548 getname_flags fs/namei.c:140 [inline] getname_flags+0xd6/0x5b0 fs/namei.c:129 getname+0x1a/0x20 fs/namei.c:211 do_sys_open+0x2c9/0x5d0 fs/open.c:1057 __do_sys_open fs/open.c:1081 [inline] __se_sys_open fs/open.c:1076 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1076 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 12669: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:457 kasan_slab_free+0xe/0x10 mm/kasan/common.c:465 __cache_free mm/slab.c:3494 [inline] kmem_cache_free+0x86/0x260 mm/slab.c:3754 putname+0xef/0x130 fs/namei.c:261 do_sys_open+0x318/0x5d0 fs/open.c:1072 __do_sys_open fs/open.c:1081 [inline] __se_sys_open fs/open.c:1076 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1076 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff888090e30000 which belongs to the cache names_cache of size 4096 The buggy address is located 836 bytes inside of 4096-byte region [ffff888090e30000, ffff888090e31000) The buggy address belongs to the page: page:ffffea0002438c00 count:1 mapcount:0 mapping:ffff88812c291180 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea00016b8388 ffffea0002519e88 ffff88812c291180 raw: 0000000000000000 ffff888090e30000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888090e30200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888090e30280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888090e30300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ kobject: 'loop4' (00000000f1f894a1): kobject_uevent_env ffff888090e30380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888090e30400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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