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ubi: Check for too small LEB size in VTBL code 

ANBZ: #15901

commit 68a24aba7c upstream.

If the LEB size is smaller than a volume table record we cannot
have volumes.
In this case abort attaching.

Cc: Chenyuan Yang <cy54@illinois.edu>
Cc: stable@vger.kernel.org
Fixes: 801c135ce7 ("UBI: Unsorted Block Images")
Reported-by: Chenyuan Yang <cy54@illinois.edu>
Closes: https://lore.kernel.org/linux-mtd/1433EB7A-FC89-47D6-8F47-23BE41B263B3@illinois.edu/
Signed-off-by: Richard Weinberger <richard@nod.at>
Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
Fixes: CVE-2024-25739
Signed-off-by: Wang Yaxin <wang.yaxin@zte.com.cn>
Reviewed-by: Guixin Liu <kanie@linux.alibaba.com>
Link: https://gitee.com/anolis/cloud-kernel/pulls/5143
This commit is contained in:
Richard Weinberger 2024-01-24 07:37:02 +01:00 committed by 小龙
parent cbc816d668
commit 4bad2cd190
1 changed files with 6 additions and 0 deletions
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6
drivers/mtd/ubi/vtbl.c
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@ -791,6 +791,12 @@ int ubi_read_volume_table(struct ubi_device *ubi, struct ubi_attach_info *ai)
* The number of supported volumes is limited by the eraseblock size
* and by the UBI_MAX_VOLUMES constant.
*/
if (ubi->leb_size < UBI_VTBL_RECORD_SIZE) {
ubi_err(ubi, "LEB size too small for a volume record");
return -EINVAL;
}
ubi->vtbl_slots = ubi->leb_size / UBI_VTBL_RECORD_SIZE;
if (ubi->vtbl_slots > UBI_MAX_VOLUMES)
ubi->vtbl_slots = UBI_MAX_VOLUMES;