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Subject[34-longterm 020/209] irda: Fix parameter extraction stack overflow
Date
From: Samuel Ortiz <samuel@sortiz.org>

=====================================================================
| This is a commit scheduled for the next v2.6.34 longterm release. |
| If you see a problem with using this for longterm, please comment.|
=====================================================================

commit efc463eb508798da4243625b08c7396462cabf9f upstream.

Reported-by: Ilja Van Sprundel <ivansprundel@ioactive.com>
Signed-off-by: Samuel Ortiz <samuel@sortiz.org>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
---
net/irda/parameters.c | 4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/net/irda/parameters.c b/net/irda/parameters.c
index fc1a205..71cd38c 100644
--- a/net/irda/parameters.c
+++ b/net/irda/parameters.c
@@ -298,6 +298,8 @@ static int irda_extract_string(void *self, __u8 *buf, int len, __u8 pi,

p.pi = pi; /* In case handler needs to know */
p.pl = buf[1]; /* Extract length of value */
+ if (p.pl > 32)
+ p.pl = 32;

IRDA_DEBUG(2, "%s(), pi=%#x, pl=%d\n", __func__,
p.pi, p.pl);
@@ -318,7 +320,7 @@ static int irda_extract_string(void *self, __u8 *buf, int len, __u8 pi,
(__u8) str[0], (__u8) str[1]);

/* Null terminate string */
- str[p.pl+1] = '\0';
+ str[p.pl] = '\0';

p.pv.c = str; /* Handler will need to take a copy */

--
1.7.4.4


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