linux-kernel - [tip:x86/urgent] bzip2/lzma/gzip: pre-boot malloc doesn't return NULL on failure

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Message-ID: <tip-c1e7c3ae59b065bf7ff24a05cb609b2f9e314db6@git.kernel.org>
Date:	Tue, 15 Dec 2009 22:57:38 GMT
From:	tip-bot for Phillip Lougher <phillip@...gher.demon.co.uk>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, phillip@...gher.demon.co.uk,
	hpa@...or.com, mingo@...hat.com, tglx@...utronix.de
Subject: [tip:x86/urgent] bzip2/lzma/gzip: pre-boot malloc doesn't return NULL on failure

Commit-ID:  c1e7c3ae59b065bf7ff24a05cb609b2f9e314db6
Gitweb:     http://git.kernel.org/tip/c1e7c3ae59b065bf7ff24a05cb609b2f9e314db6
Author:     Phillip Lougher <phillip@...gher.demon.co.uk>
AuthorDate: Mon, 14 Dec 2009 21:45:19 +0000
Committer:  H. Peter Anvin <hpa@...or.com>
CommitDate: Tue, 15 Dec 2009 14:04:12 -0800

bzip2/lzma/gzip: pre-boot malloc doesn't return NULL on failure

The trivial malloc implementation used in the pre-boot environment by the
decompressors returns a bad pointer on failure (falling through after
calling error).  This is doubly wrong - the callers expect malloc to
return NULL on failure, second the error function is intended to be
used by the decompressors to propagate errors to *their* callers.  The
decompressors have no access to any state set by the error function.

Signed-off-by: Phillip Lougher <phillip@...gher.demon.co.uk>
LKML-Reference: <4b26b1ef.hIInb2AYPMtImAJO%phillip@...gher.demon.co.uk>
Signed-off-by: H. Peter Anvin <hpa@...or.com>
---
 include/linux/decompress/mm.h |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/decompress/mm.h b/include/linux/decompress/mm.h
index 12ff8c3..5032b9a 100644
--- a/include/linux/decompress/mm.h
+++ b/include/linux/decompress/mm.h
@@ -25,7 +25,7 @@ static void *malloc(int size)
 	void *p;
 
 	if (size < 0)
-		error("Malloc error");
+		return NULL;
 	if (!malloc_ptr)
 		malloc_ptr = free_mem_ptr;
 
@@ -35,7 +35,7 @@ static void *malloc(int size)
 	malloc_ptr += size;
 
 	if (free_mem_end_ptr && malloc_ptr >= free_mem_end_ptr)
-		error("Out of memory");
+		return NULL;
 
 	malloc_count++;
 	return p;
--
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