From f735b5eeb9fcbb001e0cf2a5296b19c4bbaec55f Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Tue, 23 Dec 2008 12:44:19 +0100 Subject: [PATCH] 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 --- mm/bounce.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/mm/bounce.c b/mm/bounce.c index bf0cf7c..e590272 100644 --- a/mm/bounce.c +++ b/mm/bounce.c @@ -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; -- 2.7.4