linux-kernel - [PATCH] drivers/net/wireless/hostap: Integer overflow

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Date:	Wed, 18 Dec 2013 13:56:12 +0800
From:	Wenliang Fan <fanwlexca@...il.com>
To:	j@...fi, linville@...driver.com
Cc:	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Wenliang Fan <fanwlexca@...il.com>
Subject: [PATCH] drivers/net/wireless/hostap: Integer overflow

The local variable 'value' comes from 'extra', a parameter of function
'prism2_ioctl_priv_prism2_param'. If a large number passed to 'value',
there would be an integer overflow in the following line:
	local->passive_scan_timer.expires = jiffies +
		local->passive_scan_interval * HZ

Signed-off-by: Wenliang Fan <fanwlexca@...il.com>
---
 drivers/net/wireless/hostap/hostap_ioctl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/hostap/hostap_ioctl.c b/drivers/net/wireless/hostap/hostap_ioctl.c
index e509030..63e350a 100644
--- a/drivers/net/wireless/hostap/hostap_ioctl.c
+++ b/drivers/net/wireless/hostap/hostap_ioctl.c
@@ -2567,7 +2567,7 @@ static int prism2_ioctl_priv_prism2_param(struct net_device *dev,
 		local->passive_scan_interval = value;
 		if (timer_pending(&local->passive_scan_timer))
 			del_timer(&local->passive_scan_timer);
-		if (value > 0) {
+		if (value > 0 && value < INT_MAX / HZ) {
 			local->passive_scan_timer.expires = jiffies +
 				local->passive_scan_interval * HZ;
 			add_timer(&local->passive_scan_timer);
-- 
1.8.5.rc1.28.g7061504

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