XFS (loop5): Mounting V4 Filesystem
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BUG: KASAN: use-after-free in xlog_alloc_log+0x11cb/0x1390 fs/xfs/xfs_log.c:1495
Read of size 8 at addr ffff8880a4421890 by task syz-executor.5/20034

CPU: 0 PID: 20034 Comm: syz-executor.5 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+0x1fb/0x318 lib/dump_stack.c:118
 print_address_description+0x75/0x5c0 mm/kasan/report.c:374
 __kasan_report+0x14b/0x1c0 mm/kasan/report.c:506
 kasan_report+0x26/0x50 mm/kasan/common.c:634
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132
 xlog_alloc_log+0x11cb/0x1390 fs/xfs/xfs_log.c:1495
 xfs_log_mount+0xc6/0x750 fs/xfs/xfs_log.c:599
 xfs_mountfs+0xbf1/0x1bb0 fs/xfs/xfs_mount.c:811
 xfs_fs_fill_super+0x1099/0x14e0 fs/xfs/xfs_super.c:1732
 mount_bdev+0x27c/0x390 fs/super.c:1415
 xfs_fs_mount+0x34/0x40 fs/xfs/xfs_super.c:1806
 legacy_get_tree+0xf9/0x1a0 fs/fs_context.c:647
 vfs_get_tree+0x8b/0x2a0 fs/super.c:1545
 do_new_mount fs/namespace.c:2822 [inline]
 do_mount+0x16bb/0x24f0 fs/namespace.c:3142
 ksys_mount+0xcc/0x100 fs/namespace.c:3351
 __do_sys_mount fs/namespace.c:3365 [inline]
 __se_sys_mount fs/namespace.c:3362 [inline]
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3362
 do_syscall_64+0xf7/0x1c0 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:00007f915a5e0a88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f915a5e0b40 RCX: 000000000045d0ca
RDX: 00007f915a5e0ae0 RSI: 0000000020000000 RDI: 00007f915a5e0b00
RBP: 0000000000000001 R08: 00007f915a5e0b40 R09: 00007f915a5e0ae0
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000005
R13: 00000000004ca258 R14: 00000000004e2870 R15: 00000000ffffffff

Allocated by task 20034:
 save_stack mm/kasan/common.c:69 [inline]
 set_track mm/kasan/common.c:77 [inline]
 __kasan_kmalloc+0x11c/0x1b0 mm/kasan/common.c:510
 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:524
 __do_kmalloc mm/slab.c:3655 [inline]
 __kmalloc+0x254/0x340 mm/slab.c:3664
 kmalloc include/linux/slab.h:561 [inline]
 kmem_alloc+0x57f/0x680 fs/xfs/kmem.c:21
 kmem_zalloc fs/xfs/kmem.h:68 [inline]
 xlog_alloc_log+0x5a0/0x1390 fs/xfs/xfs_log.c:1437
 xfs_log_mount+0xc6/0x750 fs/xfs/xfs_log.c:599
 xfs_mountfs+0xbf1/0x1bb0 fs/xfs/xfs_mount.c:811
 xfs_fs_fill_super+0x1099/0x14e0 fs/xfs/xfs_super.c:1732
 mount_bdev+0x27c/0x390 fs/super.c:1415
 xfs_fs_mount+0x34/0x40 fs/xfs/xfs_super.c:1806
 legacy_get_tree+0xf9/0x1a0 fs/fs_context.c:647
 vfs_get_tree+0x8b/0x2a0 fs/super.c:1545
 do_new_mount fs/namespace.c:2822 [inline]
 do_mount+0x16bb/0x24f0 fs/namespace.c:3142
 ksys_mount+0xcc/0x100 fs/namespace.c:3351
 __do_sys_mount fs/namespace.c:3365 [inline]
 __se_sys_mount fs/namespace.c:3362 [inline]
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3362
 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 20034:
 save_stack mm/kasan/common.c:69 [inline]
 set_track mm/kasan/common.c:77 [inline]
 kasan_set_free_info mm/kasan/common.c:332 [inline]
 __kasan_slab_free+0x12a/0x1e0 mm/kasan/common.c:471
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:480
 __cache_free mm/slab.c:3425 [inline]
 kfree+0x115/0x200 mm/slab.c:3756
 kvfree+0x47/0x50 mm/util.c:593
 kmem_free fs/xfs/kmem.h:61 [inline]
 xlog_alloc_log+0x1209/0x1390 fs/xfs/xfs_log.c:1497
 xfs_log_mount+0xc6/0x750 fs/xfs/xfs_log.c:599
 xfs_mountfs+0xbf1/0x1bb0 fs/xfs/xfs_mount.c:811
 xfs_fs_fill_super+0x1099/0x14e0 fs/xfs/xfs_super.c:1732
 mount_bdev+0x27c/0x390 fs/super.c:1415
 xfs_fs_mount+0x34/0x40 fs/xfs/xfs_super.c:1806
 legacy_get_tree+0xf9/0x1a0 fs/fs_context.c:647
 vfs_get_tree+0x8b/0x2a0 fs/super.c:1545
 do_new_mount fs/namespace.c:2822 [inline]
 do_mount+0x16bb/0x24f0 fs/namespace.c:3142
 ksys_mount+0xcc/0x100 fs/namespace.c:3351
 __do_sys_mount fs/namespace.c:3365 [inline]
 __se_sys_mount fs/namespace.c:3362 [inline]
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3362
 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8880a4421800
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 144 bytes inside of
 1024-byte region [ffff8880a4421800, ffff8880a4421c00)
The buggy address belongs to the page:
page:ffffea0002910840 refcount:1 mapcount:0 mapping:ffff8880aa400c40 index:0xffff8880a4421000
raw: 00fffe0000000200 ffffea0002539308 ffffea0002283548 ffff8880aa400c40
raw: ffff8880a4421000 ffff8880a4421000 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a4421780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880a4421800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880a4421880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                         ^
 ffff8880a4421900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880a4421980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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