diff options
| author | Lei YU <mine260309@gmail.com> | 2019-07-11 10:44:48 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-08-16 10:11:02 +0200 |
| commit | 5f674df02255bb7c4aa0190a945f0868b61ff31d (patch) | |
| tree | d6f05e7f527d4b2401ed2b7d8426666d5f6107fe /drivers/hwmon | |
| parent | b95697c8e29f34331ef28aa2404bf6d86674bcd7 (diff) | |
hwmon: (occ) Fix division by zero issue
[ Upstream commit 211186cae14de09573b062e478eb9fe215aed8d9 ]
The code in occ_get_powr_avg() invokes div64_u64() without checking the
divisor. In case the divisor is zero, kernel gets an "Division by zero
in kernel" error.
Check the divisor and make it return 0 if the divisor is 0.
Fixes: c10e753d43eb ("hwmon (occ): Add sensor types and versions")
Signed-off-by: Lei YU <mine260309@gmail.com>
Reviewed-by: Eddie James <eajames@linux.ibm.com>
Link: https://lore.kernel.org/r/1562813088-23708-1-git-send-email-mine260309@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/hwmon')
| -rw-r--r-- | drivers/hwmon/occ/common.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/hwmon/occ/common.c b/drivers/hwmon/occ/common.c index 13a6290c8d25..f02aa403332c 100644 --- a/drivers/hwmon/occ/common.c +++ b/drivers/hwmon/occ/common.c @@ -402,8 +402,10 @@ static ssize_t occ_show_power_1(struct device *dev, static u64 occ_get_powr_avg(u64 *accum, u32 *samples) { - return div64_u64(get_unaligned_be64(accum) * 1000000ULL, - get_unaligned_be32(samples)); + u64 divisor = get_unaligned_be32(samples); + + return (divisor == 0) ? 0 : + div64_u64(get_unaligned_be64(accum) * 1000000ULL, divisor); } static ssize_t occ_show_power_2(struct device *dev, |