From: Sage Weil <sage@newdream.net>
Date: Thu, 12 May 2011 22:13:23 +0000 (-0700)
Subject: ceph: fix rare potential cap leak
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=3540303f87115cbdae6ed2cab44ce6a7676d48d3;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

ceph: fix rare potential cap leak

If we grab new_cap, retake the lock, and find we already have a cap now
for the given mds, release new_cap.

Signed-off-by: Sage Weil <sage@newdream.net>
---

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 2a5404c1c42f..591202bc9668 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -569,7 +569,8 @@ retry:
 		list_add_tail(&cap->session_caps, &session->s_caps);
 		session->s_nr_caps++;
 		spin_unlock(&session->s_cap_lock);
-	}
+	} else if (new_cap)
+		ceph_put_cap(mdsc, new_cap);
 
 	if (!ci->i_snap_realm) {
 		/*