Re: [PATCH 1/6] hwmon: (dell-smm) Fail in ioctl I8K_BIOS_VERSION when bios version is not a number

[Guenter Roeck]

On 06/17/2016 03:54 PM, Pali RohÃr wrote:
> ABI of I8K_BIOS_VERSION ioctl can return only number. But new BIOS versions
> contain also other characters, which does not fit into that ABI. So in case
> of non digit values return -EINVAL.
>
> Reported-by: Mario Limonciello <Mario_Limonciello@xxxxxxxx>
> Signed-off-by: Pali RohÃr <pali.rohar@xxxxxxxxx>

Applied.

Guenter

> ---
>   drivers/hwmon/dell-smm-hwmon.c |    5 +++++
>   1 file changed, 5 insertions(+)
>
> diff --git a/drivers/hwmon/dell-smm-hwmon.c b/drivers/hwmon/dell-smm-hwmon.c
> index c43318d..480b2fa 100644
> --- a/drivers/hwmon/dell-smm-hwmon.c
> +++ b/drivers/hwmon/dell-smm-hwmon.c
> @@ -35,6 +35,7 @@
>   #include <linux/uaccess.h>
>   #include <linux/io.h>
>   #include <linux/sched.h>
> +#include <linux/ctype.h>
>
>   #include <linux/i8k.h>
>
> @@ -387,6 +388,10 @@ i8k_ioctl_unlocked(struct file *fp, unsigned int cmd, unsigned long arg)
>
>   	switch (cmd) {
>   	case I8K_BIOS_VERSION:
> +		if (!isdigit(bios_version[0]) || !isdigit(bios_version[1]) ||
> +		    !isdigit(bios_version[2]))
> +			return -EINVAL;
> +
>   		val = (bios_version[0] << 16) |
>   				(bios_version[1] << 8) | bios_version[2];
>   		break;