================================================================== BUG: KASAN: use-after-free in xlog_alloc_log+0x1386/0x14b0 fs/xfs/xfs_log.c:1542 Read of size 8 at addr ffff8880a7a23890 by task syz-executor.0/19984 CPU: 0 PID: 19984 Comm: syz-executor.0 Not tainted 5.4.0-syzkaller #0 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+0x197/0x210 lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374 __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506 kasan_report+0x12/0x20 mm/kasan/common.c:639 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135 xlog_alloc_log+0x1386/0x14b0 fs/xfs/xfs_log.c:1542 xfs_log_mount+0xdc/0x780 fs/xfs/xfs_log.c:653 xfs_mountfs+0xc35/0x1ca0 fs/xfs/xfs_mount.c:775 xfs_fc_fill_super+0x84e/0x11c0 fs/xfs/xfs_super.c:1506 get_tree_bdev+0x414/0x650 fs/super.c:1340 xfs_fc_get_tree+0x1d/0x30 fs/xfs/xfs_super.c:1550 vfs_get_tree+0x8e/0x300 fs/super.c:1545 do_new_mount fs/namespace.c:2822 [inline] do_mount+0x135a/0x1b50 fs/namespace.c:3142 ksys_mount+0xdb/0x150 fs/namespace.c:3351 __do_sys_mount fs/namespace.c:3365 [inline] __se_sys_mount fs/namespace.c:3362 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3362 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45d0ca Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 4d 8c fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 2a 8c fb ff c3 66 0f 1f 84 00 00 00 00 00 RSP: 002b:00007fbb41ec8a88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fbb41ec8b40 RCX: 000000000045d0ca RDX: 00007fbb41ec8ae0 RSI: 0000000020000000 RDI: 00007fbb41ec8b00 RBP: 0000000000000001 R08: 00007fbb41ec8b40 R09: 00007fbb41ec8ae0 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000003 R13: 00000000004cab53 R14: 00000000004e3fd8 R15: 00000000ffffffff Allocated by task 19984: save_stack+0x23/0x90 mm/kasan/common.c:72 set_track mm/kasan/common.c:80 [inline] __kasan_kmalloc mm/kasan/common.c:513 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:486 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:527 __do_kmalloc mm/slab.c:3656 [inline] __kmalloc+0x163/0x770 mm/slab.c:3665 kmalloc include/linux/slab.h:561 [inline] kmem_alloc+0x15b/0x4d0 fs/xfs/kmem.c:21 kmem_zalloc fs/xfs/kmem.h:68 [inline] xlog_alloc_log+0xcc3/0x14b0 fs/xfs/xfs_log.c:1484 xfs_log_mount+0xdc/0x780 fs/xfs/xfs_log.c:653 xfs_mountfs+0xc35/0x1ca0 fs/xfs/xfs_mount.c:775 xfs_fc_fill_super+0x84e/0x11c0 fs/xfs/xfs_super.c:1506 get_tree_bdev+0x414/0x650 fs/super.c:1340 xfs_fc_get_tree+0x1d/0x30 fs/xfs/xfs_super.c:1550 vfs_get_tree+0x8e/0x300 fs/super.c:1545 do_new_mount fs/namespace.c:2822 [inline] do_mount+0x135a/0x1b50 fs/namespace.c:3142 ksys_mount+0xdb/0x150 fs/namespace.c:3351 __do_sys_mount fs/namespace.c:3365 [inline] __se_sys_mount fs/namespace.c:3362 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3362 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 19984: save_stack+0x23/0x90 mm/kasan/common.c:72 set_track mm/kasan/common.c:80 [inline] kasan_set_free_info mm/kasan/common.c:335 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:474 kasan_slab_free+0xe/0x10 mm/kasan/common.c:483 __cache_free mm/slab.c:3426 [inline] kfree+0x10a/0x2c0 mm/slab.c:3757 kvfree+0x61/0x70 mm/util.c:603 kmem_free fs/xfs/kmem.h:61 [inline] xlog_alloc_log+0xeaa/0x14b0 fs/xfs/xfs_log.c:1544 xfs_log_mount+0xdc/0x780 fs/xfs/xfs_log.c:653 xfs_mountfs+0xc35/0x1ca0 fs/xfs/xfs_mount.c:775 xfs_fc_fill_super+0x84e/0x11c0 fs/xfs/xfs_super.c:1506 get_tree_bdev+0x414/0x650 fs/super.c:1340 xfs_fc_get_tree+0x1d/0x30 fs/xfs/xfs_super.c:1550 vfs_get_tree+0x8e/0x300 fs/super.c:1545 do_new_mount fs/namespace.c:2822 [inline] do_mount+0x135a/0x1b50 fs/namespace.c:3142 ksys_mount+0xdb/0x150 fs/namespace.c:3351 __do_sys_mount fs/namespace.c:3365 [inline] __se_sys_mount fs/namespace.c:3362 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3362 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880a7a23800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 144 bytes inside of 1024-byte region [ffff8880a7a23800, ffff8880a7a23c00) The buggy address belongs to the page: page:ffffea00029e88c0 refcount:1 mapcount:0 mapping:ffff8880aa400c40 index:0xffff8880a7a23000 raw: 00fffe0000000200 ffffea00025c3848 ffffea0002887248 ffff8880aa400c40 raw: ffff8880a7a23000 ffff8880a7a23000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a7a23780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880a7a23800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880a7a23880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a7a23900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a7a23980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================