* (no subject)
@ 2017-10-09 9:12 ` Andreas Gruenbacher
0 siblings, 0 replies; 2+ messages in thread
From: Andreas Gruenbacher @ 2017-10-09 9:12 UTC (permalink / raw)
To: Alexander Viro, Linus Torvalds
Cc: Andreas Gruenbacher, Jan Kara, linux-fsdevel, linux-kernel,
cluster-devel
Date: Wed, 4 Oct 2017 23:09:38 +0200
Subject: [PATCH] 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.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: Jan Kara <jack@suse.cz>
---
fs/direct-io.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/direct-io.c b/fs/direct-io.c
index 5fa2211e49ae..e0332da392d8 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -838,7 +838,8 @@ submit_page_section(struct dio *dio, struct dio_submit *sdio, struct page *page,
*/
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;
}
--
2.13.5
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [Cluster-devel] (no subject)
@ 2017-10-09 9:12 ` Andreas Gruenbacher
0 siblings, 0 replies; 2+ messages in thread
From: Andreas Gruenbacher @ 2017-10-09 9:12 UTC (permalink / raw)
To: cluster-devel.redhat.com
Date: Wed, 4 Oct 2017 23:09:38 +0200
Subject: [PATCH] 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.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: Jan Kara <jack@suse.cz>
---
fs/direct-io.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/direct-io.c b/fs/direct-io.c
index 5fa2211e49ae..e0332da392d8 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -838,7 +838,8 @@ submit_page_section(struct dio *dio, struct dio_submit *sdio, struct page *page,
*/
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;
}
--
2.13.5
^ permalink raw reply related [flat|nested] 2+ messages in thread
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