linux-kernel - [PATCH] ubi: eba: properly rollback inside self_check

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Message-ID: <20240229204237.30453-1-pchelkin@ispras.ru>
Date: Thu, 29 Feb 2024 23:42:36 +0300
From: Fedor Pchelkin <pchelkin@...ras.ru>
To: Richard Weinberger <richard@....at>
Cc: Fedor Pchelkin <pchelkin@...ras.ru>,
	Miquel Raynal <miquel.raynal@...tlin.com>,
	Vignesh Raghavendra <vigneshr@...com>,
	Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>,
	linux-mtd@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Alexey Khoroshilov <khoroshilov@...ras.ru>,
	lvc-project@...uxtesting.org,
	stable@...r.kernel.org
Subject: [PATCH] ubi: eba: properly rollback inside self_check_eba

In case of a memory allocation failure in the volumes loop we can only
process the already allocated scan_eba and fm_eba array elements on the
error path - others are still uninitialized.

Found by Linux Verification Center (linuxtesting.org).

Fixes: 00abf3041590 ("UBI: Add self_check_eba()")
Cc: stable@...r.kernel.org
Signed-off-by: Fedor Pchelkin <pchelkin@...ras.ru>
---
 drivers/mtd/ubi/eba.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/ubi/eba.c b/drivers/mtd/ubi/eba.c
index 8d1f0e05892c..6f5eadb1598d 100644
--- a/drivers/mtd/ubi/eba.c
+++ b/drivers/mtd/ubi/eba.c
@@ -1557,6 +1557,7 @@ int self_check_eba(struct ubi_device *ubi, struct ubi_attach_info *ai_fastmap,
 					  GFP_KERNEL);
 		if (!fm_eba[i]) {
 			ret = -ENOMEM;
+			kfree(scan_eba[i]);
 			goto out_free;
 		}
 
@@ -1592,7 +1593,7 @@ int self_check_eba(struct ubi_device *ubi, struct ubi_attach_info *ai_fastmap,
 	}
 
 out_free:
-	for (i = 0; i < num_volumes; i++) {
+	while (--i >= 0) {
 		if (!ubi->volumes[i])
 			continue;
 
-- 
2.43.2