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| author | Tony Battersby <tonyb@cybernetics.com> | 2015-02-11 11:32:30 -0500 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2015-02-11 09:35:21 -0700 |
| commit | 564e559f2baf6a868768d0cac286980b3cfd6e30 (patch) | |
| tree | c05956de6d4221f4ce5935902cab4598e7d3a171 | |
| parent | 854fbb9c699e34fe4889e6907c4fc73889192223 (diff) | |
| download | linux-564e559f2baf6a868768d0cac286980b3cfd6e30.tar.gz linux-564e559f2baf6a868768d0cac286980b3cfd6e30.tar.bz2 linux-564e559f2baf6a868768d0cac286980b3cfd6e30.zip | |
blk-mq: fix double-free in error path
If the allocation of bt->bs fails, then bt->map can be freed twice, once
in blk_mq_init_bitmap_tags() -> bt_alloc(), and once in
blk_mq_init_bitmap_tags() -> bt_free(). Fix by setting the pointer to
NULL after the first free.
Cc: <stable@vger.kernel.org>
Signed-off-by: Tony Battersby <tonyb@cybernetics.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
| -rw-r--r-- | block/blk-mq-tag.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c index e3387a74a9a2..d53a764b05ea 100644 --- a/block/blk-mq-tag.c +++ b/block/blk-mq-tag.c @@ -524,6 +524,7 @@ static int bt_alloc(struct blk_mq_bitmap_tags *bt, unsigned int depth, bt->bs = kzalloc(BT_WAIT_QUEUES * sizeof(*bt->bs), GFP_KERNEL); if (!bt->bs) { kfree(bt->map); + bt->map = NULL; return -ENOMEM; } |