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authorJan Kara <jack@suse.com>2015-11-04 17:13:39 +0100
committerJens Axboe <axboe@fb.com>2015-11-11 09:36:56 -0700
commit2dbe5495763612f7c1b68fc897cd28c9e22079b8 (patch)
tree7b53e4691b04a65e508c3dd4ea4e3cff1d53a301 /drivers/block/brd.c
parentc5a37883f42be712a989e54d5d6c0159b0e56599 (diff)
brd: Refuse improperly aligned discard requests
Currently when improperly aligned discard request is submitted, we just silently discard more / less data which results in filesystem corruption in some cases. Refuse such misaligned requests. Signed-off-by: Jan Kara <jack@suse.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/block/brd.c')
-rw-r--r--drivers/block/brd.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index c9f9c30d6467..a5880f4ab40e 100644
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -337,6 +337,9 @@ static blk_qc_t brd_make_request(struct request_queue *q, struct bio *bio)
goto io_error;
if (unlikely(bio->bi_rw & REQ_DISCARD)) {
+ if (sector & ((PAGE_SIZE >> SECTOR_SHIFT) - 1) ||
+ bio->bi_iter.bi_size & PAGE_MASK)
+ goto io_error;
discard_from_brd(brd, sector, bio->bi_iter.bi_size);
goto out;
}