dm verity fec: fix bufio leaks

commit 86e3e83b443669dd2bcc5c8a83b23e3aa0694c0d upstream.

Buffers read through dm_bufio_read() were not released in all code paths.

Fixes: a739ff3f543a ("dm verity: add support for forward error correction")
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/md/dm-verity-fec.c b/drivers/md/dm-verity-fec.c
index c3cc04d89524..78f36012eaca 100644
--- a/drivers/md/dm-verity-fec.c
+++ b/drivers/md/dm-verity-fec.c
@@ -146,8 +146,6 @@ static int fec_decode_bufs(struct dm_verity *v, struct dm_verity_fec_io *fio,
                 block = fec_buffer_rs_block(v, fio, n, i);
                 res = fec_decode_rs8(v, fio, block, &par[offset], neras);
                 if (res < 0) {
-                        dm_bufio_release(buf);
-
                         r = res;
                         goto error;
                 }
@@ -172,6 +170,8 @@ static int fec_decode_bufs(struct dm_verity *v, struct dm_verity_fec_io *fio,
 done:
         r = corrected;
 error:
+        dm_bufio_release(buf);
+
         if (r < 0 && neras)
                 DMERR_LIMIT("%s: FEC %llu: failed to correct: %d",
                             v->data_dev->name, (unsigned long long)rsb, r);
@@ -269,7 +269,7 @@ static int fec_read_bufs(struct dm_verity *v, struct dm_verity_io *io,
                                           &is_zero) == 0) {
                         /* skip known zero blocks entirely */
                         if (is_zero)
-                                continue;
+                                goto done;
 
                         /*
                          * skip if we have already found the theoretical