linux-kernel - [PATCH 3.2 058/152] decompress_bunzip2: off by one in get_next

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Message-ID: <lsq.1424137613.832146625@decadent.org.uk>
Date:	Tue, 17 Feb 2015 01:46:53 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Yinghai Lu" <yinghai@...nel.org>,
	"Alain Knaff" <alain@...ff.lu>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Dan Carpenter" <dan.carpenter@...cle.com>
Subject: [PATCH 3.2 058/152] decompress_bunzip2: off by one in
 get_next_block()

3.2.67-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Carpenter <dan.carpenter@...cle.com>

commit b5c8afe5be51078a979d86ae5ae78c4ac948063d upstream.

"origPtr" is used as an offset into the bd->dbuf[] array.  That array is
allocated in start_bunzip() and has "bd->dbufSize" number of elements so
the test here should be >= instead of >.

Later we check "origPtr" again before using it as an offset so I don't
know if this bug can be triggered in real life.

Fixes: bc22c17e12c1 ('bzip2/lzma: library support for gzip, bzip2 and lzma decompression')
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Cc: Alain Knaff <alain@...ff.lu>
Cc: Yinghai Lu <yinghai@...nel.org>
Cc: "H. Peter Anvin" <hpa@...or.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 lib/decompress_bunzip2.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/lib/decompress_bunzip2.c
+++ b/lib/decompress_bunzip2.c
@@ -185,7 +185,7 @@ static int INIT get_next_block(struct bu
 	if (get_bits(bd, 1))
 		return RETVAL_OBSOLETE_INPUT;
 	origPtr = get_bits(bd, 24);
-	if (origPtr > dbufSize)
+	if (origPtr >= dbufSize)
 		return RETVAL_DATA_ERROR;
 	/* mapping table: if some byte values are never used (encoding things
 	   like ascii text), the compression code removes the gaps to have fewer

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