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BUG: KASAN: slab-use-after-free in string_nocheck lib/vsprintf.c:643 [inline]
BUG: KASAN: slab-use-after-free in string+0x50/0xfc lib/vsprintf.c:726
Read at addr faff000023abc680 by task udevd/3573
Pointer tag: [fa], memory tag: [fe]
CPU: 0 PID: 3573 Comm: udevd Not tainted 6.4.0-rc6-syzkaller-00269-g1b29d271614a #0
Hardware name: linux,dummy-virt (DT)
Call trace:
dump_backtrace+0x94/0xec arch/arm64/kernel/stacktrace.c:233
show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:240
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x48/0x60 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:351 [inline]
print_report+0xd8/0x5f4 mm/kasan/report.c:462
kasan_report+0x7c/0x9c mm/kasan/report.c:572
__do_kernel_fault+0x174/0x1c0 arch/arm64/mm/fault.c:320
do_bad_area arch/arm64/mm/fault.c:479 [inline]
do_tag_check_fault+0x78/0x8c arch/arm64/mm/fault.c:790
do_mem_abort+0x44/0x94 arch/arm64/mm/fault.c:866
el1_abort+0x40/0x60 arch/arm64/kernel/entry-common.c:367
el1h_64_sync_handler+0xd8/0xe4 arch/arm64/kernel/entry-common.c:427
el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:586
string_nocheck lib/vsprintf.c:643 [inline]
string+0x50/0xfc lib/vsprintf.c:726
vsnprintf+0x170/0x748 lib/vsprintf.c:2817
add_uevent_var+0x84/0x120 lib/kobject_uevent.c:665
dev_uevent+0x70/0x1e4 drivers/base/core.c:2575
uevent_show+0x8c/0x114 drivers/base/core.c:2646
dev_attr_show+0x20/0x6c drivers/base/core.c:2349
sysfs_kf_seq_show+0xac/0x124 fs/sysfs/file.c:59
kernfs_seq_show+0x2c/0x38 fs/kernfs/file.c:205
seq_read_iter+0x1cc/0x4d0 fs/seq_file.c:230
kernfs_fop_read_iter+0x150/0x1c4 fs/kernfs/file.c:279
call_read_iter include/linux/fs.h:1862 [inline]
new_sync_read fs/read_write.c:389 [inline]
vfs_read+0x1f4/0x284 fs/read_write.c:470
ksys_read+0x68/0xf4 fs/read_write.c:613
__do_sys_read fs/read_write.c:623 [inline]
__se_sys_read fs/read_write.c:621 [inline]
__arm64_sys_read+0x1c/0x28 fs/read_write.c:621
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x48/0x114 arch/arm64/kernel/syscall.c:52
el0_svc_common.constprop.0+0x44/0xec arch/arm64/kernel/syscall.c:142
do_el0_svc+0x38/0xa4 arch/arm64/kernel/syscall.c:193
el0_svc+0x2c/0xb0 arch/arm64/kernel/entry-common.c:637
el0t_64_sync_handler+0xb8/0xbc arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x19c/0x1a0 arch/arm64/kernel/entry.S:591
Allocated by task 5877:
kasan_save_stack+0x2c/0x54 mm/kasan/common.c:45
save_stack_info+0x38/0x118 mm/kasan/tags.c:104
kasan_save_alloc_info+0x14/0x20 mm/kasan/tags.c:138
____kasan_kmalloc mm/kasan/common.c:374 [inline]
____kasan_kmalloc mm/kasan/common.c:333 [inline]
__kasan_kmalloc+0x9c/0xa8 mm/kasan/common.c:383
kasan_kmalloc include/linux/kasan.h:196 [inline]
kmalloc_trace+0x4c/0x60 mm/slab_common.c:1062
kmalloc include/linux/slab.h:559 [inline]
raw_ioctl_init+0xfc/0x2d8 drivers/usb/gadget/legacy/raw_gadget.c:460
raw_ioctl+0x4c8/0xcb0 drivers/usb/gadget/legacy/raw_gadget.c:1250
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__arm64_sys_ioctl+0xa8/0xec fs/ioctl.c:856
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x48/0x114 arch/arm64/kernel/syscall.c:52
el0_svc_common.constprop.0+0x44/0xec arch/arm64/kernel/syscall.c:142
do_el0_svc+0x38/0xa4 arch/arm64/kernel/syscall.c:193
el0_svc+0x2c/0xb0 arch/arm64/kernel/entry-common.c:637
el0t_64_sync_handler+0xb8/0xbc arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x19c/0x1a0 arch/arm64/kernel/entry.S:591
Freed by task 5874:
kasan_save_stack+0x2c/0x54 mm/kasan/common.c:45
save_stack_info+0x38/0x118 mm/kasan/tags.c:104
kasan_save_free_info+0x18/0x24 mm/kasan/tags.c:143
____kasan_slab_free.constprop.0+0x190/0x1f8 mm/kasan/common.c:236
__kasan_slab_free+0x10/0x1c mm/kasan/common.c:244
kasan_slab_free include/linux/kasan.h:162 [inline]
slab_free_hook mm/slub.c:1781 [inline]
slab_free_freelist_hook+0xb4/0x1e8 mm/slub.c:1807
slab_free mm/slub.c:3786 [inline]
__kmem_cache_free+0x16c/0x2c0 mm/slub.c:3799
kfree+0x5c/0x74 mm/slab_common.c:1015
dev_free+0x30/0x118 drivers/usb/gadget/legacy/raw_gadget.c:210
kref_put include/linux/kref.h:65 [inline]
raw_release+0xe0/0x16c drivers/usb/gadget/legacy/raw_gadget.c:424
__fput+0x78/0x258 fs/file_table.c:321
____fput+0x10/0x1c fs/file_table.c:349
task_work_run+0x6c/0xc4 kernel/task_work.c:179
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
do_notify_resume+0x214/0x144c arch/arm64/kernel/signal.c:1304
prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
el0_svc+0xac/0xb0 arch/arm64/kernel/entry-common.c:638
el0t_64_sync_handler+0xb8/0xbc arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x19c/0x1a0 arch/arm64/kernel/entry.S:591
The buggy address belongs to the object at ffff000023abc680
which belongs to the cache kmalloc-128 of size 128
The buggy address is located 0 bytes inside of
128-byte region [ffff000023abc680, ffff000023abc700)
The buggy address belongs to the physical page:
page:00000000f6983647 refcount:1 mapcount:0 mapping:0000000000000000 index:0xfaff000023abc680 pfn:0x63abc
ksm flags: 0x1ffc00000000200(slab|node=0|zone=0|lastcpupid=0x7ff|kasantag=0x0)
page_type: 0xffffffff()
raw: 01ffc00000000200 fbff000002c01200 fffffc000023d8c0 dead000000000007
raw: faff000023abc680 000000008020001f 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff000023abc400: f9 f9 fe fe fe fe fe fe f4 f4 f4 f4 f4 fe fe fe
ffff000023abc500: fd fd fe fe fe fe fe fe f8 f8 f8 f8 f8 f8 f8 fe
>ffff000023abc600: fc fc fe fe fe fe fe fe fe fe fe fe fe fe fe fe
^
ffff000023abc700: f1 f1 fe fe fe fe fe fe f6 f6 fe fe fe fe fe fe
ffff000023abc800: f1 f1 fe fe fe fe fe fe f9 f9 fe fe fe fe fe fe
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