linux-ext4 - [patch]check NULL pointer

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Date:	Thu, 09 Jun 2011 11:31:32 +0800
From:	Shaohua Li <shaohua.li@...el.com>
To:	linux-ext4@...r.kernel.org
Cc:	Ted Ts'o <tytso@....edu>
Subject: [patch]check NULL pointer

orig_data could be NULL.

Signed-off-by: Shaohua Li <shaohua.li@...el.com>

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index cc5c157..45fc255 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3057,6 +3057,8 @@ 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;
 
+	if (!orig_data)
+		return ret;
 	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 	if (!sbi)
 		goto out_free_orig;
@@ -4285,6 +4287,8 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
 #endif
 	char *orig_data = kstrdup(data, GFP_KERNEL);
 
+	if (!orig_data)
+		return -ENOMEM;
 	/* Store the original options */
 	lock_super(sb);
 	old_sb_flags = sb->s_flags;


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