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direct-io: Prevent NULL pointer access in submit_page_section

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commit 899f0429c7d3eed886406cd72182bee3b96aa1f9 upstream.

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.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andreas Gruenbacher 2017-10-09 11:13:18 +02:00 committed by Greg Kroah-Hartman
parent ac94abbb79
commit f3b538493e
1 changed files with 2 additions and 1 deletions
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3
fs/direct-io.c
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@ -823,7 +823,8 @@ 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);
page_cache_release(sdio->cur_page);
sdio->cur_page = NULL;
}