From: Alex Elder Date: Wed, 10 Apr 2013 22:47:46 +0000 (-0500) Subject: rbd: do a safe list traversal in rbd_img_request_submit() X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=46faeed4a61e220b99591e9773057160eb437cc8;p=deliverable%2Flinux.git rbd: do a safe list traversal in rbd_img_request_submit() It's possible that the reference to the object request dropped inside the loop in rbd_img_request_submit() will be the last one, in which case the content of the object pointer can't be trusted. Use a safe form of the object request list traversal to avoid problems. This resolves: http://tracker.ceph.com/issues/4705 Signed-off-by: Alex Elder Reviewed-by: Josh Durgin --- diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index f556f8a8b3f9..b7b7a88d9f68 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -1742,9 +1742,10 @@ static int rbd_img_request_submit(struct rbd_img_request *img_request) struct rbd_device *rbd_dev = img_request->rbd_dev; struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; struct rbd_obj_request *obj_request; + struct rbd_obj_request *next_obj_request; dout("%s: img %p\n", __func__, img_request); - for_each_obj_request(img_request, obj_request) { + for_each_obj_request_safe(img_request, obj_request, next_obj_request) { int ret; obj_request->callback = rbd_img_obj_callback;