linux-kernel - [PATCH] ubifs: fix a memory leak bug

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Date:   Mon, 19 Aug 2019 22:24:50 -0500
From:   Wenwen Wang <wenwen@...uga.edu>
To:     Wenwen Wang <wenwen@...uga.edu>
Cc:     Richard Weinberger <richard@....at>,
        Artem Bityutskiy <dedekind1@...il.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-mtd@...ts.infradead.org (open list:UBI FILE SYSTEM (UBIFS)),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] ubifs: fix a memory leak bug

In __ubifs_node_verify_hmac(), 'hmac' is allocated through kmalloc().
However, it is not deallocated in the following execution if
ubifs_node_calc_hmac() fails, leading to a memory leak bug. To fix this
issue, free 'hmac' before returning the error.

Signed-off-by: Wenwen Wang <wenwen@...uga.edu>
---
 fs/ubifs/auth.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/ubifs/auth.c b/fs/ubifs/auth.c
index d9af2de..8cdbd53 100644
--- a/fs/ubifs/auth.c
+++ b/fs/ubifs/auth.c
@@ -479,8 +479,10 @@ int __ubifs_node_verify_hmac(const struct ubifs_info *c, const void *node,
 		return -ENOMEM;
 
 	err = ubifs_node_calc_hmac(c, node, len, ofs_hmac, hmac);
-	if (err)
+	if (err) {
+		kfree(hmac);
 		return err;
+	}
 
 	err = crypto_memneq(hmac, node + ofs_hmac, hmac_len);
 
-- 
2.7.4