linux-kernel - [PATCH] lib: fix potential memory free failure on unlzo()

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Date:	Sun, 20 Nov 2011 16:47:31 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org,
	Albin Tonnerre <albin.tonnerre@...e-electrons.com>,
	Lasse Collin <lasse.collin@...aani.org>
Subject: [PATCH] lib: fix potential memory free failure on unlzo()

in_buf is dynamically allocated if @input is not given,
and adjusted as processing data on every loop. However
if block metadata is corrupted it will bail out the loop
in the middle, thus in_buf will point out wrong memory.
Fix it by freeing in_buf_save instead.

Signed-off-by: Namhyung Kim <namhyung@...il.com>
Cc: Albin Tonnerre <albin.tonnerre@...e-electrons.com>
Cc: Lasse Collin <lasse.collin@...aani.org>
---
 lib/decompress_unlzo.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/lib/decompress_unlzo.c b/lib/decompress_unlzo.c
index 5a7a2adf4c4c..4531294fa62f 100644
--- a/lib/decompress_unlzo.c
+++ b/lib/decompress_unlzo.c
@@ -279,7 +279,7 @@ STATIC inline int INIT unlzo(u8 *input, int in_len,
 	ret = 0;
 exit_2:
 	if (!input)
-		free(in_buf);
+		free(in_buf_save);
 exit_1:
 	if (!output)
 		free(out_buf);
--
1.7.6

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