* [PATCH] block: blk-flush: Check return value of bio_alloc()
@ 2015-06-21 8:39 Axel Lin
0 siblings, 0 replies; only message in thread
From: Axel Lin @ 2015-06-21 8:39 UTC (permalink / raw)
To: Jens Axboe; +Cc: Ming Lei, Christoph Hellwig, linux-kernel@vger.kernel.org
bio_alloc() can return NULL, so add NULL test to prevent NULL pointer
dereference.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
---
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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2015-06-21 8:39 [PATCH] block: blk-flush: Check return value of bio_alloc() Axel Lin
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