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BUG: KASAN: slab-out-of-bounds in atomic_read include/asm-generic/atomic-instrumented.h:21 [inline]
BUG: KASAN: slab-out-of-bounds in refcount_read include/linux/refcount.h:42 [inline]
BUG: KASAN: slab-out-of-bounds in check_net include/net/net_namespace.h:236 [inline]
BUG: KASAN: slab-out-of-bounds in rds_destroy_pending net/rds/rds.h:902 [inline]
BUG: KASAN: slab-out-of-bounds in rds_cong_queue_updates+0x25d/0x5b0 net/rds/cong.c:226
Read of size 4 at addr ffff8801c84d4084 by task kworker/u4:4/6838
netlink: 'syz-executor5': attribute type 29 has an invalid length.

CPU: 1 PID: 6838 Comm: kworker/u4:4 Not tainted 4.18.0-rc3+ #127
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: krdsd rds_send_worker
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
netlink: 'syz-executor5': attribute type 29 has an invalid length.
 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:902 [inline]
 rds_cong_queue_updates+0x25d/0x5b0 net/rds/cong.c:226
netlink: 'syz-executor5': attribute type 29 has an invalid length.
netlink: 'syz-executor5': attribute type 29 has an invalid length.
 rds_recv_rcvbuf_delta.part.3+0x332/0x3e0 net/rds/recv.c:123
 rds_recv_rcvbuf_delta net/rds/recv.c:382 [inline]
 rds_recv_incoming+0x85a/0x1320 net/rds/recv.c:382
netlink: 'syz-executor5': attribute type 29 has an invalid length.
 rds_loop_xmit+0x16a/0x340 net/rds/loop.c:82
 rds_send_xmit+0x1343/0x29c0 net/rds/send.c:355
netlink: 'syz-executor5': attribute type 29 has an invalid length.
 rds_send_worker+0x153/0x300 net/rds/threads.c:199
 process_one_work+0xc73/0x1ba0 kernel/workqueue.c:2153
 worker_thread+0x189/0x13c0 kernel/workqueue.c:2296
 kthread+0x345/0x410 kernel/kthread.c:240
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412

Allocated by task 27282:
 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
 kmem_cache_alloc_trace+0x152/0x780 mm/slab.c:3620
 kmalloc include/linux/slab.h:513 [inline]
 kzalloc include/linux/slab.h:707 [inline]
 kernfs_iop_get_link+0x6d/0x660 fs/kernfs/symlink.c:124
 generic_readlink fs/namei.c:4729 [inline]
 vfs_readlink+0x2e6/0x530 fs/namei.c:4764
 do_readlinkat+0x34d/0x400 fs/stat.c:406
 __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+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 27282:
 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
netlink: 8 bytes leftover after parsing attributes in process `syz-executor5'.
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
 __cache_free mm/slab.c:3498 [inline]
 kfree+0xd9/0x260 mm/slab.c:3813
 kfree_link+0x15/0x20 fs/libfs.c:1105
 do_delayed_call include/linux/delayed_call.h:28 [inline]
 generic_readlink fs/namei.c:4734 [inline]
 vfs_readlink+0x221/0x530 fs/namei.c:4764
 do_readlinkat+0x34d/0x400 fs/stat.c:406
 __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+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8801c84d4440
 which belongs to the cache kmalloc-4096 of size 4096
The buggy address is located 956 bytes to the left of
 4096-byte region [ffff8801c84d4440, ffff8801c84d5440)
The buggy address belongs to the page:
page:ffffea0007213500 count:1 mapcount:0 mapping:ffff8801da800dc0 index:0x0 compound_mapcount: 0
flags: 0x2fffc0000008100(slab|head)
raw: 02fffc0000008100 ffffea0006a70908 ffffea0006d02808 ffff8801da800dc0
raw: 0000000000000000 ffff8801c84d4440 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c84d3f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8801c84d4000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8801c84d4080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff8801c84d4100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801c84d4180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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