linux-kernel - [PATCH v2] ext4: fix NULL pointer dereference from orig_data in fill

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Message-Id: <1320674511-1980-1-git-send-email-linkinjeon@gmail.com>
Date:	Mon,  7 Nov 2011 23:01:51 +0900
From:	Namjae Jeon <linkinjeon@...il.com>
To:	tytso@....edu
Cc:	linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org,
	Namjae Jeon <linkinjeon@...il.com>
Subject: [PATCH v2] ext4: fix NULL pointer dereference from orig_data in fill_super and remount.

Fix NULL pointer dereference from orig_data in fill_super and remount.

Signed-off-by: Namjae Jeon <linkinjeon@...il.com>
---
 fs/ext4/super.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 9953d80..717b3e8 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3102,7 +3102,6 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 				__releases(kernel_lock)
 				__acquires(kernel_lock)
 {
-	char *orig_data = kstrdup(data, GFP_KERNEL);
 	struct buffer_head *bh;
 	struct ext4_super_block *es = NULL;
 	struct ext4_sb_info *sbi;
@@ -3125,6 +3124,10 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 	unsigned int journal_ioprio = DEFAULT_JOURNAL_IOPRIO;
 	ext4_group_t first_not_zeroed;
 
+	char *orig_data = kstrdup(data, GFP_KERNEL);
+	if (!orig_data)
+		return ret;
+
 	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 	if (!sbi)
 		goto out_free_orig;
@@ -4398,6 +4401,8 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
 	int i;
 #endif
 	char *orig_data = kstrdup(data, GFP_KERNEL);
+	if (!orig_data)
+		return -ENOMEM;
 
 	/* Store the original options */
 	lock_super(sb);
-- 
1.7.4.4

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