From 14ba3153efd9ccf3cb3cba7d15be87bf5757e2ee Mon Sep 17 00:00:00 2001
From: Derrick Brashear <shadow@dementia.org>
Date: Tue, 24 Mar 2009 22:40:25 +0000
Subject: [PATCH] STABLE14-shutdown-vcache-avoid-null-deref-20090324

LICENSE IPL10

avoid potential null pointer deref at shutdown


(cherry picked from commit 4162ff9d4d733afc788b3c002adc57aac78a3282)
---
 src/afs/afs_vcache.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/afs/afs_vcache.c b/src/afs/afs_vcache.c
index d5e1bab5b6..4a214e4ea3 100644
--- a/src/afs/afs_vcache.c
+++ b/src/afs/afs_vcache.c
@@ -3072,7 +3072,7 @@ shutdown_vcache(void)
      */
 
     {
-	register struct afs_q *tq, *uq;
+	register struct afs_q *tq, *uq = NULL;
 	register struct vcache *tvc;
 	for (tq = VLRU.prev; tq != &VLRU; tq = uq) {
 	    tvc = QTOV(tq);
@@ -3127,7 +3127,8 @@ shutdown_vcache(void)
 		    tvc->linkData = 0;
 		}
 
-		afs_FreeAllAxs(&(tvc->Access));
+		if (tvc->Access)
+		    afs_FreeAllAxs(&(tvc->Access));
 	    }
 	    afs_vhashT[i] = 0;
 	}