diff options
| author | NeilBrown <neilb@suse.de> | 2006-10-30 22:07:21 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-10-31 08:07:01 -0800 |
| commit | 5ddfe9691c91a244e8d1be597b6428fcefd58103 (patch) | |
| tree | d051fd7c370a7b8ad91f24c6f99f985b8b1252b2 /block | |
| parent | 45ec4ababe999cb95f9c0cad03b2689cb0b77a2b (diff) | |
| download | lwn-5ddfe9691c91a244e8d1be597b6428fcefd58103.tar.gz lwn-5ddfe9691c91a244e8d1be597b6428fcefd58103.zip | |
[PATCH] md: check bio address after mapping through partitions.
Partitions are not limited to live within a device. So we should range
check after partition mapping.
Note that 'maxsector' was being used for two different things. I have
split off the second usage into 'old_sector' so that maxsector can be still
be used for it's primary usage later in the function.
Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Neil Brown <neilb@suse.de>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'block')
| -rw-r--r-- | block/ll_rw_blk.c | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c index 136066583c68..c7b1dac8bee9 100644 --- a/block/ll_rw_blk.c +++ b/block/ll_rw_blk.c @@ -2999,6 +2999,7 @@ void generic_make_request(struct bio *bio) { request_queue_t *q; sector_t maxsector; + sector_t old_sector; int ret, nr_sectors = bio_sectors(bio); dev_t old_dev; @@ -3027,7 +3028,7 @@ void generic_make_request(struct bio *bio) * NOTE: we don't repeat the blk_size check for each new device. * Stacking drivers are expected to know what they are doing. */ - maxsector = -1; + old_sector = -1; old_dev = 0; do { char b[BDEVNAME_SIZE]; @@ -3061,15 +3062,30 @@ end_io: */ blk_partition_remap(bio); - if (maxsector != -1) + if (old_sector != -1) blk_add_trace_remap(q, bio, old_dev, bio->bi_sector, - maxsector); + old_sector); blk_add_trace_bio(q, bio, BLK_TA_QUEUE); - maxsector = bio->bi_sector; + old_sector = bio->bi_sector; old_dev = bio->bi_bdev->bd_dev; + maxsector = bio->bi_bdev->bd_inode->i_size >> 9; + if (maxsector) { + sector_t sector = bio->bi_sector; + + if (maxsector < nr_sectors || maxsector - nr_sectors < sector) { + /* + * This may well happen - partitions are not checked + * to make sure they are within the size of the + * whole device. + */ + handle_bad_sector(bio); + goto end_io; + } + } + ret = q->make_request_fn(q, bio); } while (ret); } |