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 <[email protected]>
---
drivers/block/rbd.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 3c0abe6..7eb1032 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -1652,9 +1652,10 @@ 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;
ret = rbd_obj_request_submit(osdc, obj_request);
--
1.7.9.5
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