linux-kernel - [Patch 1/3] elf: fix one check-after-use

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Date:	Wed, 1 Jul 2009 01:06:26 -0400
From:	Amerigo Wang <amwang@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	Roland McGrath <roland@...hat.com>,
	Serge Hallyn <serue@...ibm.com>,
	David Howells <dhowells@...hat.com>,
	Amerigo Wang <amwang@...hat.com>,
	James Morris <jmorris@...ei.org>,
	linux-fsdevel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [Patch 1/3] elf: fix one check-after-use


Check before use it.

Signed-off-by: WANG Cong <amwang@...hat.com>
Cc: Alexander Viro <viro@...iv.linux.org.uk>
Cc: David Howells <dhowells@...hat.com>

---
Index: linux-2.6/fs/binfmt_elf.c
===================================================================
--- linux-2.6.orig/fs/binfmt_elf.c
+++ linux-2.6/fs/binfmt_elf.c
@@ -1522,11 +1522,11 @@ static int fill_note_info(struct elfhdr 
 	info->thread = NULL;
 
 	psinfo = kmalloc(sizeof(*psinfo), GFP_KERNEL);
-	fill_note(&info->psinfo, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);
-
 	if (psinfo == NULL)
 		return 0;
 
+	fill_note(&info->psinfo, "CORE", NT_PRPSINFO, sizeof(*psinfo), psinfo);
+
 	/*
 	 * Figure out how many notes we're going to need for each thread.
 	 */
--
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