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| author | Kazuhisa Ichikawa <ki@epsilou.com> | 2009-05-12 13:27:45 +0200 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2009-05-12 13:27:45 +0200 |
| commit | af498d7fa3e786f52650819a56e117ed9a40920c (patch) | |
| tree | 4170275db90f306935e35be1c2cd2cbd6a1a27a8 | |
| parent | a4d7749be5de4a7261bcbe3c7d96c748792ec455 (diff) | |
| download | lwn-af498d7fa3e786f52650819a56e117ed9a40920c.tar.gz lwn-af498d7fa3e786f52650819a56e117ed9a40920c.zip | |
block: fix the bio_vec array index out-of-bounds test
Current bio_vec array index out-of-bounds test within
__end_that_request_first() does not seem correct.
It checks bio->bi_idx against bio->bi_vcnt, but the subsequent code
uses idx (which is, bio->bi_idx + next_idx) as the array index into
bio_vec array. This means that the test really make sense only at
the first iteration of !(nr_bytes >=bio->bi_size) case (when next_idx
== zero). Fix this by replacing bio->bi_idx with idx.
(This patch applies to 2.6.30-rc4.)
Signed-off-by: Kazuhisa Ichikawa <ki@epsilou.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
| -rw-r--r-- | block/blk-core.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index 2998fe3a2377..c89883be8737 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -1768,10 +1768,10 @@ static int __end_that_request_first(struct request *req, int error, } else { int idx = bio->bi_idx + next_idx; - if (unlikely(bio->bi_idx >= bio->bi_vcnt)) { + if (unlikely(idx >= bio->bi_vcnt)) { blk_dump_rq_flags(req, "__end_that"); printk(KERN_ERR "%s: bio idx %d >= vcnt %d\n", - __func__, bio->bi_idx, bio->bi_vcnt); + __func__, idx, bio->bi_vcnt); break; } |