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bio: fix memcpy corruption in bio_copy_user_iov()

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st driver uses blk_rq_map_user() in order to just build a request out
of page frames. In this case, map_data->offset is a non zero value and
iov[0].iov_base is NULL. We need to increase nr_pages for that.

Cc: stable@kernel.org
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
FUJITA Tomonori 2009-04-28 20:24:29 +02:00 committed by Jens Axboe
parent 0191944282
commit 69838727bc
1 changed files with 3 additions and 0 deletions
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3
fs/bio.c
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@ -817,6 +817,9 @@ struct bio *bio_copy_user_iov(struct request_queue *q,
len += iov[i].iov_len; len += iov[i].iov_len;
} }
if (offset)
nr_pages++;
bmd = bio_alloc_map_data(nr_pages, iov_count, gfp_mask); bmd = bio_alloc_map_data(nr_pages, iov_count, gfp_mask);
if (!bmd) if (!bmd)
return ERR_PTR(-ENOMEM); return ERR_PTR(-ENOMEM);