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hwmon: (fam15h_power) Fix unintentional integer overflow 

Expression with two unsigned integer variables is calculated as unsigned integer
before it is converted to u64. This may result in an integer overflow.
Fix by typecasting the left operand to u64 before performing the left shift.

This patch addresses Coverity #402320: Unintentional integer overflow.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Andreas Herrmann <andreas.herrmann3@amd.com>
This commit is contained in:
Guenter Roeck 2012-06-21 06:26:12 -07:00
parent 58c3667d83
commit 62867d491a
1 changed files with 2 additions and 1 deletions
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3
drivers/hwmon/fam15h_power.c
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@ -67,7 +67,8 @@ static ssize_t show_power(struct device *dev,
REG_TDP_LIMIT3, &val);
tdp_limit = val >> 16;
curr_pwr_watts = (tdp_limit + data->base_tdp) << running_avg_range;
curr_pwr_watts = ((u64)(tdp_limit +
data->base_tdp)) << running_avg_range;
curr_pwr_watts -= running_avg_capture;
curr_pwr_watts *= data->tdp_to_watts;