linux-kernel - [PATCH] isofs: fix potential memory leak in mount option parsing

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Date:   Sat, 14 Apr 2018 20:16:06 +0800
From:   Chengguang Xu <cgxu519@....com>
To:     jack@...e.cz, dhowells@...hat.com, elfring@...rs.sourceforge.net,
        viro@...iv.linux.org.uk
Cc:     linux-kernel@...r.kernel.org, Chengguang Xu <cgxu519@....com>
Subject: [PATCH] isofs: fix potential memory leak in mount option parsing

When specifying string type mount option (e.g., iocharset)
several times in a mount, current option parsing may
cause memory leak. Hence, call kfree for previous one
in this case. Meanwhile, check memory allocation result
for it.

Signed-off-by: Chengguang Xu <cgxu519@....com>
---
 fs/isofs/inode.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
index bc258a4..ec3fba7 100644
--- a/fs/isofs/inode.c
+++ b/fs/isofs/inode.c
@@ -394,7 +394,10 @@ static int parse_options(char *options, struct iso9660_options *popt)
 			break;
 #ifdef CONFIG_JOLIET
 		case Opt_iocharset:
+			kfree(popt->iocharset);
 			popt->iocharset = match_strdup(&args[0]);
+			if (!popt->iocharset)
+				return 0;
 			break;
 #endif
 		case Opt_map_a:
-- 
1.8.3.1