[PATCH] block: blk-flush: Check return value of bio_alloc()

[Axel Lin]

bio_alloc() can return NULL, so add NULL test to prevent NULL pointer
dereference.

Signed-off-by: Axel Lin <axel.lin@xxxxxxxxxx>
---
 block/blk-flush.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/block/blk-flush.c b/block/blk-flush.c
index 20badd7..4706641 100644
--- a/block/blk-flush.c
+++ b/block/blk-flush.c
@@ -470,6 +470,9 @@ int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask,
 		return -ENXIO;
 
 	bio = bio_alloc(gfp_mask, 0);
+	if (!bio)
+		return -ENOMEM;
+
 	bio->bi_bdev = bdev;
 
 	ret = submit_bio_wait(WRITE_FLUSH, bio);
-- 
2.1.0



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