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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>
This commit is contained in:
Jing Zhang 2010-05-12 00:00:00 -04:00 committed by Theodore Ts'o
parent c26d0bad3d
commit b720303df7
1 changed files with 8 additions and 7 deletions
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15
fs/ext4/extents.c
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@ -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