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BUG: KASAN: slab-use-after-free in dm_table_get_mode+0x60/0x68 drivers/md/dm-table.c:2121
Read of size 4 at addr ffff0000d75134f4 by task syz.1.7295/2493

CPU: 0 UID: 0 PID: 2493 Comm: syz.1.7295 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 print_address_description+0xb0/0x238 mm/kasan/report.c:378
 print_report+0x68/0x84 mm/kasan/report.c:482
 kasan_report+0x8c/0xc4 mm/kasan/report.c:595
 __asan_report_load4_noabort+0x20/0x2c mm/kasan/report_generic.c:380
 dm_table_get_mode+0x60/0x68 drivers/md/dm-table.c:2121
 do_resume drivers/md/dm-ioctl.c:1317 [inline]
 dev_suspend+0x40c/0x750 drivers/md/dm-ioctl.c:1360
 ctl_ioctl drivers/md/dm-ioctl.c:2213 [inline]
 dm_ctl_ioctl+0x884/0xbbc drivers/md/dm-ioctl.c:2235
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __arm64_sys_ioctl+0x154/0x1cc fs/ioctl.c:583
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758
 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590

Allocated by task 2493:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x40/0x78 mm/kasan/common.c:78
 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:570
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0x9c/0xb4 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __kmalloc_cache_noprof+0x2f4/0x5fc mm/slub.c:5563
 _kmalloc_noprof include/linux/slab.h:991 [inline]
 _kzalloc_noprof include/linux/slab.h:1312 [inline]
 dm_table_create+0x8c/0x2ac drivers/md/dm-table.c:136
 table_load+0x104/0x764 drivers/md/dm-ioctl.c:1631
 ctl_ioctl drivers/md/dm-ioctl.c:2213 [inline]
 dm_ctl_ioctl+0x884/0xbbc drivers/md/dm-ioctl.c:2235
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __arm64_sys_ioctl+0x154/0x1cc fs/ioctl.c:583
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758
 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590

Freed by task 2494:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x40/0x78 mm/kasan/common.c:78
 kasan_save_free_info+0x54/0x6c mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_slab_free+0x74/0xa4 mm/kasan/common.c:285
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2748 [inline]
 slab_free mm/slub.c:6508 [inline]
 kfree+0x188/0x698 mm/slub.c:6801
 dm_table_destroy+0x32c/0x3a0 drivers/md/dm-table.c:210
 do_resume drivers/md/dm-ioctl.c:1341 [inline]
 dev_suspend+0x5a4/0x750 drivers/md/dm-ioctl.c:1360
 ctl_ioctl drivers/md/dm-ioctl.c:2213 [inline]
 dm_ctl_ioctl+0x884/0xbbc drivers/md/dm-ioctl.c:2235
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __arm64_sys_ioctl+0x154/0x1cc fs/ioctl.c:583
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758
 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:777
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590

The buggy address belongs to the object at ffff0000d7513400
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 244 bytes inside of
 freed 512-byte region [ffff0000d7513400, ffff0000d7513600)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff0000d7511c00 pfn:0x117510
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x5ffc00000000240(workingset|head|node=0|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 05ffc00000000240 ffff0000c0001c80 fffffdffc3c21e10 fffffdffc35db510
raw: ffff0000d7511c00 000000000010000f 00000000f5000000 0000000000000000
head: 05ffc00000000240 ffff0000c0001c80 fffffdffc3c21e10 fffffdffc35db510
head: ffff0000d7511c00 000000000010000f 00000000f5000000 0000000000000000
head: 05ffc00000000002 fffffdffc35d4401 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000d7513380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000d7513400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff0000d7513480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                             ^
 ffff0000d7513500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000d7513580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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