block: WARN in __blk_put_request() for potential bio leak
Put a WARN_ON in __blk_put_request if it is about to
leak bio(s). This is a serious bug that can happen in error
handling code paths.
For this to work I have fixed a couple of places in block/ where
request->bio != NULL ownership was not honored. And a small cleanup
at sg_io() while at it.
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
index ee9c67d..626ee27 100644
--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -214,21 +214,10 @@
return 0;
}
-/*
- * unmap a request that was previously mapped to this sg_io_hdr. handles
- * both sg and non-sg sg_io_hdr.
- */
-static int blk_unmap_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr)
-{
- blk_rq_unmap_user(rq->bio);
- blk_put_request(rq);
- return 0;
-}
-
static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
struct bio *bio)
{
- int r, ret = 0;
+ int ret = 0;
/*
* fill in all the output members
@@ -253,12 +242,10 @@
ret = -EFAULT;
}
- rq->bio = bio;
- r = blk_unmap_sghdr_rq(rq, hdr);
- if (ret)
- r = ret;
+ blk_rq_unmap_user(bio);
+ blk_put_request(rq);
- return r;
+ return ret;
}
static int sg_io(struct request_queue *q, struct gendisk *bd_disk,