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authorPali Rohár <pali.rohar@gmail.com>2016-06-18 00:54:44 +0200
committerGuenter Roeck <linux@roeck-us.net>2016-06-18 12:55:20 -0700
commit053ea640818812313892ec4f370f5cfac42fd355 (patch)
tree75c74adedf6d7f6725a3ef9466430e3f035443e4 /drivers/hwmon/dell-smm-hwmon.c
parent5edb56491d4812c42175980759da53388e5d86f5 (diff)
hwmon: (dell-smm) Fail in ioctl I8K_BIOS_VERSION when bios version is not a number
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@dell.com> Signed-off-by: Pali Rohár <pali.rohar@gmail.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon/dell-smm-hwmon.c')
-rw-r--r--drivers/hwmon/dell-smm-hwmon.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/hwmon/dell-smm-hwmon.c b/drivers/hwmon/dell-smm-hwmon.c
index c43318d3416e..480b2fae9541 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;