direct-io: Prevent NULL pointer access in submit_page_section

In the code added to function submit_page_section by commit b1058b981,
sdio->bio can currently be NULL when calling dio_bio_submit.  This then
leads to a NULL pointer access in dio_bio_submit, so check for a NULL
bio in submit_page_section before trying to submit it instead.

Fixes xfstest generic/250 on gfs2.

Cc: stable@vger.kernel.org # v3.10+
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/direct-io.c b/fs/direct-io.c
index 62cf812ed0e5..96415c65bbdc 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -866,7 +866,8 @@ out:
          */
         if (sdio->boundary) {
                 ret = dio_send_cur_page(dio, sdio, map_bh);
-                dio_bio_submit(dio, sdio);
+                if (sdio->bio)
+                        dio_bio_submit(dio, sdio);
                 put_page(sdio->cur_page);
                 sdio->cur_page = NULL;
         }