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direct-io: Prevent NULL pointer access in submit_page_section

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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: [email protected] # v3.10+
Signed-off-by: Andreas Gruenbacher <[email protected]>
Reviewed-by: Jan Kara <[email protected]>
Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Andreas Gruenbacher authored and Al Viro committed 2017-10-10 23:10:02 -04:00
1 parent 8a5776a5f4
commit 899f0429c7
1 file changed
+2 -1
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fs/direct-io.c
+2 -1
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@@ -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;
}