Under memory pressure, bio_alloc_bioset() may fail and return NULL. Add a
check to handle this case gracefully by returning -ENOMEM instead of
dereferencing a NULL pointer.
Signed-off-by: Ye Chey <yechey@xxxxxxxxxxx>
---
drivers/block/drbd/drbd_actlog.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/block/drbd/drbd_actlog.c b/drivers/block/drbd/drbd_actlog.c
index 742b2908f..68b925b49 100644
--- a/drivers/block/drbd/drbd_actlog.c
+++ b/drivers/block/drbd/drbd_actlog.c
@@ -141,6 +141,10 @@ static int _drbd_md_sync_page_io(struct drbd_device *device,
bio = bio_alloc_bioset(bdev->md_bdev, 1, op | op_flags, GFP_NOIO,
&drbd_md_io_bio_set);
+ if (!bio) {
+ err = -ENOMEM;
+ goto out;
+ }
bio->bi_iter.bi_sector = sector;
err = -EIO;
if (bio_add_page(bio, device->md_io.page, size, 0) != size)
--
2.44.0
