linux-kernel - [PATCH] ipmi: fix unsigned long overflow

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Message-ID: <1501296161-74544-1-git-send-email-chenweilong@huawei.com>
Date:   Sat, 29 Jul 2017 10:42:41 +0800
From:   Weilong Chen <chenweilong@...wei.com>
To:     <minyard@....org>
CC:     <openipmi-developer@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] ipmi: fix unsigned long overflow

When I set the timeout to a specific value such as 500ms, the timeout
event will not happen in time due to the overflow in function
check_msg_timeout:
...
	ent->timeout -= timeout_period;
	if (ent->timeout > 0)
		return;
...

The type of timeout_period is long, but ent->timeout is unsigned long.
This patch makes the type consistent.

Signed-off-by: Weilong Chen <chenweilong@...wei.com>
---
 drivers/char/ipmi/ipmi_msghandler.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/char/ipmi/ipmi_msghandler.c b/drivers/char/ipmi/ipmi_msghandler.c
index 810b138..4c806e9 100644
--- a/drivers/char/ipmi/ipmi_msghandler.c
+++ b/drivers/char/ipmi/ipmi_msghandler.c
@@ -135,8 +135,8 @@ struct seq_table {
 	unsigned int         inuse : 1;
 	unsigned int         broadcast : 1;
 
-	unsigned long        timeout;
-	unsigned long        orig_timeout;
+	long        timeout;
+	long        orig_timeout;
 	unsigned int         retries_left;
 
 	/*
-- 
1.8.3.1