================================================================== BUG: KASAN: slab-out-of-bounds in __list_add_valid+0x9a/0xa0 lib/list_debug.c:26 Read of size 8 at addr ffff888091eaf7e0 by task syz-executor.5/16088 CPU: 1 PID: 16088 Comm: syz-executor.5 Not tainted 5.0.0-rc6+ #74 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 __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:60 [inline] list_add_tail include/linux/list.h:93 [inline] cma_listen_on_all drivers/infiniband/core/cma.c:2477 [inline] rdma_listen+0x63b/0x8e0 drivers/infiniband/core/cma.c:3492 ucma_listen+0x14d/0x1c0 drivers/infiniband/core/ucma.c:1100 ucma_write+0x2da/0x3c0 drivers/infiniband/core/ucma.c:1689 __vfs_write+0x116/0x8e0 fs/read_write.c:485 vfs_write+0x20c/0x580 fs/read_write.c:549 ksys_write+0xea/0x1f0 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 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:00007f03ded8bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457e29 RDX: 0000000000000010 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f03ded8c6d4 R13: 00000000004c706f R14: 00000000004dca78 R15: 00000000ffffffff Allocated by task 8132: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_kmalloc mm/kasan/common.c:496 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:469 kasan_kmalloc mm/kasan/common.c:504 [inline] kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:411 kmem_cache_alloc+0x12d/0x710 mm/slab.c:3543 getname_flags fs/namei.c:140 [inline] getname_flags+0xd6/0x5b0 fs/namei.c:129 user_path_at_empty+0x2f/0x50 fs/namei.c:2608 do_readlinkat+0xe9/0x320 fs/stat.c:397 __do_sys_readlink fs/stat.c:430 [inline] __se_sys_readlink fs/stat.c:427 [inline] __x64_sys_readlink+0x78/0xb0 fs/stat.c:427 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 8132: 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:458 kasan_slab_free+0xe/0x10 mm/kasan/common.c:466 __cache_free mm/slab.c:3487 [inline] kmem_cache_free+0x86/0x260 mm/slab.c:3749 putname+0xef/0x130 fs/namei.c:261 filename_lookup+0x28f/0x410 fs/namei.c:2357 user_path_at_empty+0x43/0x50 fs/namei.c:2608 do_readlinkat+0xe9/0x320 fs/stat.c:397 __do_sys_readlink fs/stat.c:430 [inline] __se_sys_readlink fs/stat.c:427 [inline] __x64_sys_readlink+0x78/0xb0 fs/stat.c:427 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 ffff888091eae740 which belongs to the cache names_cache of size 4096 The buggy address is located 160 bytes to the right of 4096-byte region [ffff888091eae740, ffff888091eaf740) The buggy address belongs to the page: page:ffffea000247ab80 count:1 mapcount:0 mapping:ffff88821bc45380 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea0002435b08 ffffea0002426c08 ffff88821bc45380 raw: 0000000000000000 ffff888091eae740 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888091eaf680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888091eaf700: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888091eaf780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888091eaf800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888091eaf880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================