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hwmon: (pmbus/ibm-cffps) Prevent writing on_off_config with bad data

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If the user write parameters resulted in no bytes being written to the
temporary buffer, then ON_OFF_CONFIG will be written with uninitialized
data. Prevent this by bailing out in this case.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
Link: https://lore.kernel.org/r/1578411640-16929-1-git-send-email-eajames@linux.ibm.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Eddie James 2020-01-07 09:40:40 -06:00 committed by Guenter Roeck
parent 392923715d
commit d9c8ae69b9
1 changed files with 1 additions and 1 deletions
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2
drivers/hwmon/pmbus/ibm-cffps.c
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@ -250,7 +250,7 @@ static ssize_t ibm_cffps_debugfs_write(struct file *file,
pmbus_set_page(psu->client, 0);
rc = simple_write_to_buffer(&data, 1, ppos, buf, count);
if (rc < 0)
if (rc <= 0)
return rc;
rc = i2c_smbus_write_byte_data(psu->client,