linux-kernel - [PATCH v4 4/4] mtd: parsers: afs: Fix freeing the part name memory in failure

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Date:   Mon,  4 Jan 2021 09:41:37 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     miquel.raynal@...tlin.com, richard@....at, vigneshr@...com,
        robh+dt@...nel.org
Cc:     bjorn.andersson@...aro.org, linux-mtd@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH v4 4/4] mtd: parsers: afs: Fix freeing the part name memory in failure

In the case of failure while parsing the partitions, the iterator should
be pre decremented by one before starting to free the memory allocated
by kstrdup(). Because in the failure case, kstrdup() will not succeed
and thus no memory will be allocated for the current iteration.

Fixes: 1fca1f6abb38 ("mtd: afs: simplify partition parsing")
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
Cc: Linus Walleij <linus.walleij@...aro.org>
---
 drivers/mtd/parsers/afs.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/mtd/parsers/afs.c b/drivers/mtd/parsers/afs.c
index 980e332bdac4..26116694c821 100644
--- a/drivers/mtd/parsers/afs.c
+++ b/drivers/mtd/parsers/afs.c
@@ -370,10 +370,8 @@ static int parse_afs_partitions(struct mtd_info *mtd,
 	return i;
 
 out_free_parts:
-	while (i >= 0) {
+	while (--i >= 0)
 		kfree(parts[i].name);
-		i--;
-	}
 	kfree(parts);
 	*pparts = NULL;
 	return ret;
-- 
2.25.1