linux-kernel - [PATCH] ext3: fix ext34_fill_super group description initialization

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Message-ID: <20070813090954.GA25226@dnb.sw.ru>
Date:	Mon, 13 Aug 2007 13:09:54 +0400
From:	Dmitry Monakhov <dmonakhov@...nvz.org>
To:	linux-kernel@...r.kernel.org
Cc:	linux-ext4@...r.kernel.org, devel@...nvz.org
Subject: [PATCH] ext3: fix ext34_fill_super group description initialization

->s_group_desc have to be zero filled because if sb_read() failed
we jump to following error path.
failed_mount2:
	for (i = 0; i < db_count; i++)
		brelse(sbi->s_group_desc[i]);<< Bad things may happen here

Signed-off-by: Dmitry Monakhov <dmonakhov@...nvz.org>
---
 fs/ext3/super.c |    2 +-
 fs/ext4/super.c |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/ext3/super.c b/fs/ext3/super.c
index f8ac18f..208738e 100644
--- a/fs/ext3/super.c
+++ b/fs/ext3/super.c
@@ -1718,7 +1718,7 @@ static int ext3_fill_super (struct super_block *sb, void *data, int silent)
 				       / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
 	db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
 		   EXT3_DESC_PER_BLOCK(sb);
-	sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
+	sbi->s_group_desc = kzalloc(db_count * sizeof (struct buffer_head *),
 				    GFP_KERNEL);
 	if (sbi->s_group_desc == NULL) {
 		printk (KERN_ERR "EXT3-fs: not enough memory\n");
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 8f1d2f6..fefffc0 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1830,7 +1830,7 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
 	sbi->s_groups_count = blocks_count;
 	db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
 		   EXT4_DESC_PER_BLOCK(sb);
-	sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
+	sbi->s_group_desc = kzalloc(db_count * sizeof (struct buffer_head *),
 				    GFP_KERNEL);
 	if (sbi->s_group_desc == NULL) {
 		printk (KERN_ERR "EXT4-fs: not enough memory\n");
-- 
1.5.2.2


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