linux-ext4 - [PATCH 2.6.33.y 18/40] ext4: fix memory leaks in error path handling of ext4_ext

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Message-Id: <1275393807-14369-18-git-send-email-tytso@mit.edu>
Date:	Tue,  1 Jun 2010 08:03:05 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	stable@...r.kernel.org
Cc:	Ext4 Developers List <linux-ext4@...r.kernel.org>,
	Jing Zhang <zj.barak@...il.com>,
	"Theodore Ts'o" <tytso@....edu>
Subject: [PATCH 2.6.33.y 18/40] ext4: fix memory leaks in error path handling of ext4_ext_zeroout()

From: Jing Zhang <zj.barak@...il.com>

commit b720303df7352d4a7a1f61e467e0a124913c0d41 upstream (as of v2.6.34-git13)

When EIO occurs after bio is submitted, there is no memory free
operation for bio, which results in memory leakage. And there is also
no check against bio_alloc() for bio.

Acked-by: Dave Kleikamp <shaggy@...ux.vnet.ibm.com>
Signed-off-by: Jing Zhang <zj.barak@...il.com>
Signed-off-by: "Theodore Ts'o" <tytso@....edu>
---
 fs/ext4/extents.c |   15 ++++++++-------
 1 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 3afdded..032c95b 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -2440,7 +2440,7 @@ static void bi_complete(struct bio *bio, int error)
 /* FIXME!! we need to try to merge to left or right after zero-out  */
 static int ext4_ext_zeroout(struct inode *inode, struct ext4_extent *ex)
 {
-	int ret = -EIO;
+	int ret;
 	struct bio *bio;
 	int blkbits, blocksize;
 	sector_t ee_pblock;
@@ -2464,6 +2464,9 @@ static int ext4_ext_zeroout(struct inode *inode, struct ext4_extent *ex)
 			len = ee_len;
 
 		bio = bio_alloc(GFP_NOIO, len);
+		if (!bio)
+			return -ENOMEM;
+
 		bio->bi_sector = ee_pblock;
 		bio->bi_bdev   = inode->i_sb->s_bdev;
 
@@ -2491,17 +2494,15 @@ static int ext4_ext_zeroout(struct inode *inode, struct ext4_extent *ex)
 		submit_bio(WRITE, bio);
 		wait_for_completion(&event);
 
-		if (test_bit(BIO_UPTODATE, &bio->bi_flags))
-			ret = 0;
-		else {
-			ret = -EIO;
-			break;
+		if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) {
+			bio_put(bio);
+			return -EIO;
 		}
 		bio_put(bio);
 		ee_len    -= done;
 		ee_pblock += done  << (blkbits - 9);
 	}
-	return ret;
+	return 0;
 }
 
 #define EXT4_EXT_ZERO_LEN 7
-- 
1.6.6.1.1.g974db.dirty

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