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btrfs: fix memory leaks after failure to lookup checksums during inode logging

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commit 4f26433e9b upstream.

While logging an inode, at copy_items(), if we fail to lookup the checksums
for an extent we release the destination path, free the ins_data array and
then return immediately. However a previous iteration of the for loop may
have added checksums to the ordered_sums list, in which case we leak the
memory used by them.

So fix this by making sure we iterate the ordered_sums list and free all
its checksums before returning.

Fixes: 3650860b90 ("Btrfs: remove almost all of the BUG()'s from tree-log.c")
CC: stable@vger.kernel.org # 4.4+
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Filipe Manana 2020-07-29 10:17:50 +01:00 • committed by Greg Kroah-Hartman
commit 183af2d27d
1 changed files with 2 additions and 6 deletions
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8
fs/btrfs/tree-log.c
View file

@ -3988,11 +3988,8 @@ static noinline int copy_items(struct btrfs_trans_handle *trans,
fs_info->csum_root,
ds + cs, ds + cs + cl - 1,
&ordered_sums, 0);
if (ret) {
btrfs_release_path(dst_path);
kfree(ins_data);
return ret;
}
if (ret)
break;
}
}
}
@ -4005,7 +4002,6 @@ static noinline int copy_items(struct btrfs_trans_handle *trans,
* we have to do this after the loop above to avoid changing the
* log tree while trying to change the log tree.
*/
ret = 0;
while (!list_empty(&ordered_sums)) {
struct btrfs_ordered_sum *sums = list_entry(ordered_sums.next,
struct btrfs_ordered_sum,