On Thu, 5 Dec 2013 17:54:59 +0300, Dan Carpenter wrote:
> The "rpm * div" operations can overflow here, so this patch adds an
> upper limit to rpm to prevent that. Jean Delvare helped me with this
> patch.
>
> Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
> ---
> v2: cap "rpm" instead of just checking for divide by zero.
>
> diff --git a/drivers/hwmon/vt8231.c b/drivers/hwmon/vt8231.c
> index 48025b725777..b3babe3326fb 100644
> --- a/drivers/hwmon/vt8231.c
> +++ b/drivers/hwmon/vt8231.c
> @@ -145,7 +145,7 @@ static const u8 regtempmin[] = { 0x3a, 0x3e, 0x2c, 0x2e, 0x30, 0x32 };
> */
> static inline u8 FAN_TO_REG(long rpm, int div)
> {
> - if (rpm == 0)
> + if (rpm <= 0 || rpm > 1310720)
> return 0;
> return clamp_val(1310720 / (rpm * div), 1, 255);
> }
> diff --git a/drivers/hwmon/lm78.c b/drivers/hwmon/lm78.c
> index 6cf6bff79003..28976d64aa2b 100644
> --- a/drivers/hwmon/lm78.c
> +++ b/drivers/hwmon/lm78.c
> @@ -94,6 +94,8 @@ static inline u8 FAN_TO_REG(long rpm, int div)
> {
> if (rpm <= 0)
> return 255;
> + if (rpm > 1350000)
> + return 1;
> return clamp_val((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
> }
>
> diff --git a/drivers/hwmon/sis5595.c b/drivers/hwmon/sis5595.c
> index 05565d2d1e54..7e7e25b0473d 100644
> --- a/drivers/hwmon/sis5595.c
> +++ b/drivers/hwmon/sis5595.c
> @@ -141,6 +141,8 @@ static inline u8 FAN_TO_REG(long rpm, int div)
> {
> if (rpm <= 0)
> return 255;
> + if (rpm > 1350000)
> + return 1;
> return clamp_val((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
> }
>
Applied, thanks.
--
Jean Delvare
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