linux-kernel - [PATCH] exfat: call brelse() on error path

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Date:   Wed, 10 Jun 2020 12:59:34 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Namjae Jeon <namjae.jeon@...sung.com>,
        linux-fsdevel@...r.kernel.org,
        Sungjong Seo <sj1557.seo@...sung.com>
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
        Pali Rohár <pali@...nel.org>,
        Tetsuhiro Kohada <kohada.t2@...il.com>,
        Wei Yongjun <weiyongjun1@...wei.com>
Subject: [PATCH] exfat: call brelse() on error path

If the second exfat_get_dentry() call fails then we need to release
"old_bh" before returning.

Reported-by: Markus Elfring <Markus.Elfring@....de>
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
---
 fs/exfat/namei.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fs/exfat/namei.c b/fs/exfat/namei.c
index 5b0f35329d63e..fda92c824ff11 100644
--- a/fs/exfat/namei.c
+++ b/fs/exfat/namei.c
@@ -1077,10 +1077,14 @@ static int exfat_rename_file(struct inode *inode, struct exfat_chain *p_dir,
 
 		epold = exfat_get_dentry(sb, p_dir, oldentry + 1, &old_bh,
 			&sector_old);
+		if (!epold)
+			return -EIO;
 		epnew = exfat_get_dentry(sb, p_dir, newentry + 1, &new_bh,
 			&sector_new);
-		if (!epold || !epnew)
+		if (!epnew) {
+			brelse(old_bh);
 			return -EIO;
+		}
 
 		memcpy(epnew, epold, DENTRY_SIZE);
 		exfat_update_bh(sb, new_bh, sync);
-- 
2.26.2