Hi,
在 2025/05/23 17:35, Ye Chey 写道:
The bio_alloc_bioset() call in md_super_write() could fail under memory
pressure and return NULL. Add a check to handle this case gracefully by
returning early, preventing a potential NULL pointer dereference.
NAK, if you read the comments of bio_alloc_bioset(), you'll know there
are cases bio_alloc_bioset() will never return NULL.
Thanks,
Kuai
Signed-off-by: Ye Chey <yechey@xxxxxxxxxxx>
---
drivers/md/md.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 9daa78c5f..a0e2d90d4 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -1002,6 +1002,8 @@ void md_super_write(struct mddev *mddev, struct md_rdev *rdev,
REQ_OP_WRITE | REQ_SYNC | REQ_IDLE | REQ_META
| REQ_PREFLUSH | REQ_FUA,
GFP_NOIO, &mddev->sync_set);
+ if (!bio)
+ return;
atomic_inc(&rdev->nr_pending);
