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authorJing Zhang <zj.barak@gmail.com>2010-05-12 00:00:00 -0400
committerTheodore Ts'o <tytso@mit.edu>2010-05-12 00:00:00 -0400
commitb720303df7352d4a7a1f61e467e0a124913c0d41 (patch)
treed0c102111ed28ced2d3a0dbfed987f9b8ed5db37
parentc26d0bad3d0e951487e5dee36632dd3817f42b10 (diff)
downloadop-kernel-dev-b720303df7352d4a7a1f61e467e0a124913c0d41.zip
op-kernel-dev-b720303df7352d4a7a1f61e467e0a124913c0d41.tar.gz
ext4: fix memory leaks in error path handling of ext4_ext_zeroout()
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@linux.vnet.ibm.com> Signed-off-by: Jing Zhang <zj.barak@gmail.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
-rw-r--r--fs/ext4/extents.c15
1 files changed, 8 insertions, 7 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 236b834..228eeaf 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -2544,7 +2544,7 @@ 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;
@@ -2568,6 +2568,9 @@ 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;
@@ -2595,17 +2598,15 @@ 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
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