[v5,13/20] md: check for failure when adding pages in alloc_behind_master_bio

Commit Message

Johannes Thumshirn May 2, 2023, 10:19 a.m. UTC

alloc_behind_master_bio() can possibly add multiple pages to a bio, but it
is not checking for the return value of bio_add_page() if adding really
succeeded.

Check if the page adding succeeded and if not bail out.

Reviewed-by: Damien Le Moal <[e-mail]>
Signed-off-by: Johannes Thumshirn <[e-mail]>
---
 drivers/md/raid1.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

Patch

diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index 68a9e2d9985b..8283ef177f6c 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1147,7 +1147,10 @@  static void alloc_behind_master_bio(struct r1bio *r1_bio,
 		if (unlikely(!page))
 			goto free_pages;
 
-		bio_add_page(behind_bio, page, len, 0);
+		if (!bio_add_page(behind_bio, page, len, 0)) {
+			free_page(page);
+			goto free_pages;
+		}
 
 		size -= len;
 		i++;