block: Warn and free bio if bi_end_io is not set

In bio_endio if bio doesn't have bi_end_io (should be an error case),
we set bio to NULL and continue silently without freeing the bio. It
would be good to have a WARN and free the bio to avoid memory leak.

Signed-off-by: Muthukumar Ratty <muthur@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 9 insertions, 0 deletions

diff --git a/fs/bio.c b/fs/bio.c
index 75c49a382239..9156bd1f151c 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -1770,6 +1770,15 @@ void bio_endio(struct bio *bio, int error)
                 } else {
                         if (bio->bi_end_io)
                                 bio->bi_end_io(bio, error);
+                        else {
+                                char dev_name[BDEVNAME_SIZE];
+
+                                WARN(1, "bio_endio: bio for %s without endio\n",
+                                        bio->bi_bdev ? bdevname(bio->bi_bdev,
+                                        dev_name) : "(unknown)");
+                                bio_put(bio);
+                        }
+
                         bio = NULL;
                 }
         }