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authorTony Battersby <tonyb@cybernetics.com>2015-02-11 11:32:30 -0500
committerJens Axboe <axboe@fb.com>2015-02-11 09:35:21 -0700
commit564e559f2baf6a868768d0cac286980b3cfd6e30 (patch)
treec05956de6d4221f4ce5935902cab4598e7d3a171 /block/blk-mq-tag.c
parent854fbb9c699e34fe4889e6907c4fc73889192223 (diff)
downloadkernel-564e559f2baf6a868768d0cac286980b3cfd6e30.tar.gz
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>
Diffstat (limited to 'block/blk-mq-tag.c')
-rw-r--r--block/blk-mq-tag.c1
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;
}