linux-kernel - [PATCH] [18/106] UBIFS: fix oops on error path in read

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Date:	Tue, 26 Apr 2011 14:12:56 -0700 (PDT)
From:	Andi Kleen <andi@...stfloor.org>
To:	Artem.Bityutskiy@...ia.com, gregkh@...e.de, ak@...ux.intel.com,
	linux-kernel@...r.kernel.org, stable@...nel.org,
	tim.bird@...sony.com
Subject: [PATCH] [18/106] UBIFS: fix oops on error path in read_pnode

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Artem Bityutskiy <Artem.Bityutskiy@...ia.com>

commit 54acbaaa523ca0bd284a18f67ad213c379679e86 upstream.

Thanks to coverity which spotted that UBIFS will oops if 'kmalloc()'
in 'read_pnode()' fails and we dereference a NULL 'pnode' pointer
when we 'goto out'.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@...ia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 fs/ubifs/lpt.c |    7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

Index: linux-2.6.35.y/fs/ubifs/lpt.c
===================================================================
--- linux-2.6.35.y.orig/fs/ubifs/lpt.c
+++ linux-2.6.35.y/fs/ubifs/lpt.c
@@ -1270,10 +1270,9 @@ static int read_pnode(struct ubifs_info 
 	lnum = branch->lnum;
 	offs = branch->offs;
 	pnode = kzalloc(sizeof(struct ubifs_pnode), GFP_NOFS);
-	if (!pnode) {
-		err = -ENOMEM;
-		goto out;
-	}
+	if (!pnode)
+		return -ENOMEM;
+
 	if (lnum == 0) {
 		/*
 		 * This pnode was not written which just means that the LEB
--
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