From: Xiaotian Feng <[email protected]> ===================================================================== | This is a commit scheduled for the next v2.6.34 longterm release. | | If you see a problem with using this for longterm, please comment.| =====================================================================
commit 5478755616ae2ef1ce144dded589b62b2a50d575 upstream. commit 9284bcf checks for proper length of iov entries in blk_rq_map_user_iov(). But if the map is unaligned, kernel will break out the loop without checking for the proper length. So we need to check the proper length before the unalign check. Signed-off-by: Xiaotian Feng <[email protected]> Signed-off-by: Jens Axboe <[email protected]> Signed-off-by: Paul Gortmaker <[email protected]> --- block/blk-map.c | 5 +++-- 1 files changed, 3 insertions(+), 2 deletions(-) diff --git a/block/blk-map.c b/block/blk-map.c index 30a7e51..749effa 100644 --- a/block/blk-map.c +++ b/block/blk-map.c @@ -201,12 +201,13 @@ int blk_rq_map_user_iov(struct request_queue *q, struct request *rq, for (i = 0; i < iov_count; i++) { unsigned long uaddr = (unsigned long)iov[i].iov_base; + if (!iov[i].iov_len) + return -EINVAL; + if (uaddr & queue_dma_alignment(q)) { unaligned = 1; break; } - if (!iov[i].iov_len) - return -EINVAL; } if (unaligned || (q->dma_pad_mask & len) || map_data) -- 1.7.4.4 _______________________________________________ stable mailing list [email protected] http://linux.kernel.org/mailman/listinfo/stable
