Re: [patch] watchdog: w83977f_wdt: underflow in wdt_set_timeout()

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On 11/06/2015 01:56 AM, Dan Carpenter wrote:
"t" is controlled by the user.  If "t" is a very large integer then it
could lead to a negative "tmrval".  We cap the upper bound of "tmrval"
but, in the current code, we allow negatives.  This is a bug and it
causes a static checker warning.  Let's make "tmrval" unsigned to avoid
this problem.

Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>


Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>

diff --git a/drivers/watchdog/w83977f_wdt.c b/drivers/watchdog/w83977f_wdt.c
index 91bf55a..20e2bba 100644
--- a/drivers/watchdog/w83977f_wdt.c
+++ b/drivers/watchdog/w83977f_wdt.c
@@ -224,7 +224,7 @@ static int wdt_keepalive(void)

  static int wdt_set_timeout(int t)
  {
-	int tmrval;
+	unsigned int tmrval;

  	/*
  	 * Convert seconds to watchdog counter time units, rounding up.
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