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btrfs/raid56: fix and cleanup some error paths

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The alloc_rbio() frees "raid_map" and "bbio" on error, so there is a
potential double free bug in raid56_parity_write().  The
raid56_parity_write() and raid56_parity_recover() functions should still
free "raid_map" and "bbio" on error if other errors occur though, so I
have added some more calls to kfree().

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
This commit is contained in:
Dan Carpenter 2013-07-22 09:55:15 +03:00 committed by Chris Mason
parent 2112ac800d
commit 3dc0e818af
1 changed files with 4 additions and 6 deletions
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10
fs/btrfs/raid56.c
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@ -1687,11 +1687,8 @@ int raid56_parity_write(struct btrfs_root *root, struct bio *bio,
struct blk_plug_cb *cb;
rbio = alloc_rbio(root, bbio, raid_map, stripe_len);
if (IS_ERR(rbio)) {
kfree(raid_map);
kfree(bbio);
if (IS_ERR(rbio))
return PTR_ERR(rbio);
}
bio_list_add(&rbio->bio_list, bio);
rbio->bio_list_bytes = bio->bi_size;
@ -2041,9 +2038,8 @@ int raid56_parity_recover(struct btrfs_root *root, struct bio *bio,
int ret;
rbio = alloc_rbio(root, bbio, raid_map, stripe_len);
if (IS_ERR(rbio)) {
if (IS_ERR(rbio))
return PTR_ERR(rbio);
}
rbio->read_rebuild = 1;
bio_list_add(&rbio->bio_list, bio);
@ -2052,6 +2048,8 @@ int raid56_parity_recover(struct btrfs_root *root, struct bio *bio,
rbio->faila = find_logical_bio_stripe(rbio, bio);
if (rbio->faila == -1) {
BUG();
kfree(raid_map);
kfree(bbio);
kfree(rbio);
return -EIO;
}