linux-kernel - [PATCH -mm] reiser4: remove lzo compression security hole

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Date:	Thu, 24 May 2007 23:54:00 +0100
From:	Richard Purdie <rpurdie@...ys.net>
To:	akpm <akpm@...ux-foundation.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, edward@...esys.com,
	vs@...esys.com
Subject: [PATCH -mm] reiser4: remove lzo compression security hole

Switch reiser4 to use lzo1x_decompress_safe instead of lzo1x_decompress
as otherwise it presents a security hole (lzo1x_decompress doesn't
perform bounds checking on the decompressed data).

Signed-off-by: Richard Purdie <rpurdie@...ys.net>

---
 fs/reiser4/plugin/compress/compress.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6.21/fs/reiser4/plugin/compress/compress.c
===================================================================
--- linux-2.6.21.orig/fs/reiser4/plugin/compress/compress.c	2007-05-16 20:47:45.000000000 +0100
+++ linux-2.6.21/fs/reiser4/plugin/compress/compress.c	2007-05-24 23:43:28.000000000 +0100
@@ -319,7 +319,7 @@ lzo1_decompress(coa_t coa, __u8 * src_fi
 	assert("edward-851", coa == NULL);
 	assert("edward-852", src_len != 0);
 
-	result = lzo1x_decompress(src_first, src_len, dst_first, &dstlen, NULL);
+	result = lzo1x_decompress_safe(src_first, src_len, dst_first, &dstlen, NULL);
 	if (result != LZO_E_OK)
 		warning("edward-853", "lzo1x_1_decompress failed\n");
 	*dst_len = dstlen;


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