This is a note to let you know that I've just added the patch titled
ubi: Check for too small LEB size in VTBL code
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ubi-check-for-too-small-leb-size-in-vtbl-code.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 2261917e41adc0645e06802ee44069bb712c875b
Author: Richard Weinberger <richard@xxxxxx>
Date: Wed Jan 24 07:37:02 2024 +0100
ubi: Check for too small LEB size in VTBL code
[ Upstream commit 68a24aba7c593eafa8fd00f2f76407b9b32b47a9 ]
If the LEB size is smaller than a volume table record we cannot
have volumes.
In this case abort attaching.
Cc: Chenyuan Yang <cy54@xxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 801c135ce73d ("UBI: Unsorted Block Images")
Reported-by: Chenyuan Yang <cy54@xxxxxxxxxxxx>
Closes: https://lore.kernel.org/linux-mtd/1433EB7A-FC89-47D6-8F47-23BE41B263B3@xxxxxxxxxxxx/
Signed-off-by: Richard Weinberger <richard@xxxxxx>
Reviewed-by: Zhihao Cheng <chengzhihao1@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/mtd/ubi/vtbl.c b/drivers/mtd/ubi/vtbl.c
index f700f0e4f2ec4..6e5489e233dd2 100644
--- a/drivers/mtd/ubi/vtbl.c
+++ b/drivers/mtd/ubi/vtbl.c
@@ -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;
