linux-kernel - [PATCH] ubi: Check for too small LEB size in VTBL code

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20240124063702.5642-1-richard@nod.at>
Date: Wed, 24 Jan 2024 07:37:02 +0100
From: Richard Weinberger <richard@....at>
To: linux-mtd@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org,
	Richard Weinberger <richard@....at>,
	Chenyuan Yang <cy54@...inois.edu>,
	stable@...r.kernel.org
Subject: [PATCH] ubi: Check for too small LEB size in VTBL code

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

Cc: Chenyuan Yang <cy54@...inois.edu>
Cc: stable@...r.kernel.org
Fixes: 801c135ce73d ("UBI: Unsorted Block Images")
Reported-by: Chenyuan Yang <cy54@...inois.edu>
Closes: https://lore.kernel.org/linux-mtd/1433EB7A-FC89-47D6-8F47-23BE41B263B3@illinois.edu/
Signed-off-by: Richard Weinberger <richard@....at>
---
 drivers/mtd/ubi/vtbl.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/mtd/ubi/vtbl.c b/drivers/mtd/ubi/vtbl.c
index f700f0e4f2ec..6e5489e233dd 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;
-- 
2.35.3