linux-kernel - [PATCH] unionfs: fix memory leak when calling krealloc

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Date:	Wed, 21 Feb 2007 14:21:22 +0200 (EET)
From:	Pekka J Enberg <penberg@...helsinki.fi>
To:	akpm@...ux-foundation.org
cc:	jsipek@....cs.sunysb.edu, linux-kernel@...r.kernel.org
Subject: [PATCH] unionfs: fix memory leak when calling krealloc

From: Pekka Enberg <penberg@...helsinki.fi>

We must not overwrite the same pointer that is passed to krealloc() 
because it can return NULL without freeing the buffer.  Fixes a memory 
leak introduced by me.

Cc: Josef Sipek <jsipek@....cs.sunysb.edu>
Signed-off-by: Pekka Enberg <penberg@...helsinki.fi>
---
 fs/unionfs/copyup.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

Index: 2.6/fs/unionfs/copyup.c
===================================================================
--- 2.6.orig/fs/unionfs/copyup.c	2007-02-21 14:15:30.000000000 +0200
+++ 2.6/fs/unionfs/copyup.c	2007-02-21 14:16:19.000000000 +0200
@@ -658,11 +658,14 @@
 
 		/* grow path table */
 		if (count == num_dentry) {
-			path = krealloc(path, kmalloc_size * 2, GFP_KERNEL);
-			if (!path) {
+			void *p;
+
+			p = krealloc(path, kmalloc_size * 2, GFP_KERNEL);
+			if (!p) {
 				hidden_dentry = ERR_PTR(-ENOMEM);
 				goto out;
 			}
+			path = p;
 			kmalloc_size = ksize(path);
 			num_dentry = kmalloc_size / sizeof(struct dentry *);
 		}
-
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