ceph: avoid null deref in osd request error path
If we interrupt an osd request, we call __cancel_request, but it wasn't
verifying that req->r_osd was non-NULL before dereferencing it. This could
cause a crash if osds were flapping and we aborted a request on said osd.
Reported-by: Henry C Chang <henry_c_chang@tcloudcomputing.com>
Signed-off-by: Sage Weil <sage@newdream.net>
diff --git a/fs/ceph/osd_client.c b/fs/ceph/osd_client.c
index dfced1d..3b5571b 100644
--- a/fs/ceph/osd_client.c
+++ b/fs/ceph/osd_client.c
@@ -549,7 +549,7 @@
*/
static void __cancel_request(struct ceph_osd_request *req)
{
- if (req->r_sent) {
+ if (req->r_sent && req->r_osd) {
ceph_con_revoke(&req->r_osd->o_con, req->r_request);
req->r_sent = 0;
}