linux-kernel - [PATCH] fs/affs: fix potential memory leak in option parsing

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Message-Id: <1526963065-21134-1-git-send-email-cgxu519@gmx.com>
Date:   Tue, 22 May 2018 12:24:25 +0800
From:   Chengguang Xu <cgxu519@....com>
To:     linux-fsdevel@...r.kernel.org
Cc:     dsterba@...e.com, dhowells@...hat.com, jlayton@...hat.com,
        viro@...iv.linux.org.uk, linux-kernel@...r.kernel.org,
        Chengguang Xu <cgxu519@....com>
Subject: [PATCH] fs/affs: fix potential memory leak in option parsing

When specifying option 'prefix' multiple times,
current option parsing will cause memory leak.
Hence, call kfree for previous one in this case.

Signed-off-by: Chengguang Xu <cgxu519@....com>
---
 fs/affs/super.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/affs/super.c b/fs/affs/super.c
index e602619..d1ad11a 100644
--- a/fs/affs/super.c
+++ b/fs/affs/super.c
@@ -241,6 +241,7 @@ enum {
 			affs_set_opt(*mount_opts, SF_NO_TRUNCATE);
 			break;
 		case Opt_prefix:
+			kfree(*prefix);
 			*prefix = match_strdup(&args[0]);
 			if (!*prefix)
 				return 0;
-- 
1.8.3.1