bounce: don't rely on a zeroed bio_vec list



__blk_queue_bounce() relies on a zeroed bio_vec list, since it looks
up arbitrary indexes in the allocated bio. The block layer only
guarentees that added entries are valid, so clear memory after alloc.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

parent a0ea8622

mm/bounce.c

+7 −2

Original line number	Diff line number	Diff line
		@@ -198,8 +198,13 @@ static void __blk_queue_bounce(struct request_queue q, struct bio *bio_orig,
		/*
		* irk, bounce it
		*/
		if (!bio)
		bio = bio_alloc(GFP_NOIO, (*bio_orig)->bi_vcnt);
		if (!bio) {
		unsigned int cnt = (*bio_orig)->bi_vcnt;

		bio = bio_alloc(GFP_NOIO, cnt);
		memset(bio->bi_io_vec, 0, cnt * sizeof(struct bio_vec));
		}


		to = bio->bi_io_vec + i;