================================================================== BUG: KASAN: slab-out-of-bounds in __list_add_valid+0x9a/0xa0 lib/list_debug.c:26 Read of size 8 at addr ffff8880a84ea5e0 by task syz-executor5/9568 CPU: 1 PID: 9568 Comm: syz-executor5 Not tainted 5.0.0-rc1+ #19 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+0x1db/0x2d0 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:2474 [inline] rdma_listen+0x6c9/0xa10 drivers/infiniband/core/cma.c:3489 ucma_listen+0x1bf/0x250 drivers/infiniband/core/ucma.c:1100 ucma_write+0x36b/0x480 drivers/infiniband/core/ucma.c:1689 __vfs_write+0x116/0xb40 fs/read_write.c:485 vfs_write+0x20c/0x580 fs/read_write.c:549 ksys_write+0x105/0x260 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+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457ec9 Code: 6d b7 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 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fc583ebac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457ec9 RDX: 0000000000000010 RSI: 00000000200001c0 RDI: 0000000000000003 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc583ebb6d4 R13: 00000000004c6f67 R14: 00000000004dc5b0 R15: 00000000ffffffff Allocated by task 7600: 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+0x9/0x10 mm/kasan/common.c:504 kmem_cache_alloc_trace+0x151/0x760 mm/slab.c:3609 kmalloc include/linux/slab.h:545 [inline] kzalloc include/linux/slab.h:740 [inline] uevent_show+0x16b/0x380 drivers/base/core.c:1077 dev_attr_show+0x56/0xa0 drivers/base/core.c:786 sysfs_kf_seq_show+0x1fe/0x410 fs/sysfs/file.c:61 kernfs_seq_show+0x1fa/0x2e0 fs/kernfs/file.c:168 seq_read+0x4db/0x1130 fs/seq_file.c:229 kernfs_fop_read+0x153/0x6a0 fs/kernfs/file.c:252 __vfs_read+0x116/0xb20 fs/read_write.c:416 vfs_read+0x194/0x3e0 fs/read_write.c:452 ksys_read+0x105/0x260 fs/read_write.c:578 __do_sys_read fs/read_write.c:588 [inline] __se_sys_read fs/read_write.c:586 [inline] __x64_sys_read+0x73/0xb0 fs/read_write.c:586 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 7600: 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] kfree+0xcf/0x230 mm/slab.c:3806 uevent_show+0x2d6/0x380 drivers/base/core.c:1090 dev_attr_show+0x56/0xa0 drivers/base/core.c:786 sysfs_kf_seq_show+0x1fe/0x410 fs/sysfs/file.c:61 kernfs_seq_show+0x1fa/0x2e0 fs/kernfs/file.c:168 seq_read+0x4db/0x1130 fs/seq_file.c:229 kernfs_fop_read+0x153/0x6a0 fs/kernfs/file.c:252 __vfs_read+0x116/0xb20 fs/read_write.c:416 vfs_read+0x194/0x3e0 fs/read_write.c:452 ksys_read+0x105/0x260 fs/read_write.c:578 __do_sys_read fs/read_write.c:588 [inline] __se_sys_read fs/read_write.c:586 [inline] __x64_sys_read+0x73/0xb0 fs/read_write.c:586 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880a84eaa00 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 1056 bytes to the left of 4096-byte region [ffff8880a84eaa00, ffff8880a84eba00) The buggy address belongs to the page: page:ffffea0002a13a80 count:1 mapcount:0 mapping:ffff88812c3f0dc0 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea00028e1288 ffffea0002a15708 ffff88812c3f0dc0 raw: 0000000000000000 ffff8880a84eaa00 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a84ea480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a84ea500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880a84ea580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880a84ea600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a84ea680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================