From 48735d8d8bd701b1e0cd3d49c21e5e385ddcb077 Mon Sep 17 00:00:00 2001
From: Johannes Berg <johannes@sipsolutions.net>
Date: Wed, 29 Oct 2008 11:43:32 +0100
Subject: [PATCH] libertas: fix buffer overrun
If somebody sends an invalid beacon/probe response, that can trash the
whole BSS descriptor. The descriptor is, luckily, large enough so that
it cannot scribble past the end of it; it's well above 400 bytes long.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Cc: stable@kernel.org [2.6.24-2.6.27, bug present in some form since driver was added (2.6.22)]
Signed-off-by: John W. Linville <linville@tuxdriver.com>
---
drivers/net/wireless/libertas/scan.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/net/wireless/libertas/scan.c b/drivers/net/wireless/libertas/scan.c
index 8f66903641b9..22c4c6110521 100644
--- a/drivers/net/wireless/libertas/scan.c
+++ b/drivers/net/wireless/libertas/scan.c
@@ -598,8 +598,8 @@ static int lbs_process_bss(struct bss_descriptor *bss,
switch (elem->id) {
case MFIE_TYPE_SSID:
- bss->ssid_len = elem->len;
- memcpy(bss->ssid, elem->data, elem->len);
+ bss->ssid_len = min_t(int, 32, elem->len);
+ memcpy(bss->ssid, elem->data, bss->ssid_len);
lbs_deb_scan("got SSID IE: '%s', len %u\n",
escape_essid(bss->ssid, bss->ssid_len),
bss->ssid_len);
--
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