linux-kernel - [29/74] UBIFS: fix oops on error path in read

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Message-Id: <20110413155146.056722600@clark.kroah.org>
Date:	Wed, 13 Apr 2011 08:50:53 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Artem Bityutskiy <Artem.Bityutskiy@...ia.com>
Subject: [29/74] UBIFS: fix oops on error path in read_pnode

2.6.32-longterm review patch.  If anyone has any objections, please let us 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>

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

--- a/fs/ubifs/lpt.c
+++ b/fs/ubifs/lpt.c
@@ -1269,10 +1269,9 @@ 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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