diff --git a/[refs] b/[refs]
index 226cc06ddfd0..33c22e96c55d 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 879a5a001b62a020e074d460b3a7c0fd993f9832
+refs/heads/master: 71879d3cb3dd8f2dfdefb252775c1b3ea04a3dd4
diff --git a/trunk/fs/proc/base.c b/trunk/fs/proc/base.c
index 9cde9edf9c4d..c3617ea7830b 100644
--- a/trunk/fs/proc/base.c
+++ b/trunk/fs/proc/base.c
@@ -822,8 +822,8 @@ loff_t mem_lseek(struct file *file, loff_t offset, int orig)
 static int mem_release(struct inode *inode, struct file *file)
 {
 	struct mm_struct *mm = file->private_data;
-
-	mmput(mm);
+	if (mm)
+		mmput(mm);
 	return 0;
 }