From 745d9f4a31defec731119ee8aad8ba9f2536dd9a Mon Sep 17 00:00:00 2001
From: Fedor Pchelkin <pchelkin@ispras.ru>
Date: Thu, 29 Feb 2024 23:42:36 +0300
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@vger.kernel.org
Signed-off-by: Fedor Pchelkin <pchelkin@ispras.ru>
Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
---
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 e5ac3cd0bbae6..c7ba7a15c9f78 100644
--- a/drivers/mtd/ubi/eba.c
+++ b/drivers/mtd/ubi/eba.c
@@ -1564,6 +1564,7 @@ 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;
}
@@ -1599,7 +1600,7 @@ 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;
--
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