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| author | Jean Delvare <khali@linux-fr.org> | 2012-12-19 22:17:00 +0100 |
|---|---|---|
| committer | Jean Delvare <khali@endymion.delvare> | 2012-12-19 22:17:00 +0100 |
| commit | 45633fb370fdd16608756d587245459bf8983a26 (patch) | |
| tree | c5f840fea63b034ef56f1bd15179ddae20790f25 | |
| parent | 8f3c7c547d47bcfcf9ca2ed30b79733ce1e7ad3a (diff) | |
| download | op-kernel-dev-45633fb370fdd16608756d587245459bf8983a26.zip op-kernel-dev-45633fb370fdd16608756d587245459bf8983a26.tar.gz | |
hwmon: (w83627ehf) Get rid of smatch warnings
The smatch static code analyzer complains:
drivers/hwmon/w83627ehf.c:911 w83627ehf_update_device() error: buffer overflow 'W83627EHF_REG_TEMP_OFFSET' 3 <= 8
drivers/hwmon/w83627ehf.c:909 w83627ehf_update_device() error: buffer overflow 'data->temp_offset' 3 <= 8
drivers/hwmon/w83627ehf.c:2672 w83627ehf_resume() error: buffer overflow 'W83627EHF_REG_TEMP_OFFSET' 3 <= 8
drivers/hwmon/w83627ehf.c:2673 w83627ehf_resume() error: buffer overflow 'data->temp_offset' 3 <= 8
A deeper analysis of the code shows that these are false positives, as
only the lower 3 bits of data->have_temp_offset can be set so the
write is never attempted with i >= 3. However this shows that the code
isn't very robust and future changes could easily introduce a buffer
overflow. So let's add a safety check to prevent that and make smatch
happy.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Peter Huewe <PeterHuewe@gmx.de>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
| -rw-r--r-- | drivers/hwmon/w83627ehf.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/hwmon/w83627ehf.c b/drivers/hwmon/w83627ehf.c index 7fbd0ba..0e8ffd6 100644 --- a/drivers/hwmon/w83627ehf.c +++ b/drivers/hwmon/w83627ehf.c @@ -905,6 +905,8 @@ static struct w83627ehf_data *w83627ehf_update_device(struct device *dev) data->temp_max_hyst[i] = w83627ehf_read_temp(data, data->reg_temp_hyst[i]); + if (i > 2) + continue; if (data->have_temp_offset & (1 << i)) data->temp_offset[i] = w83627ehf_read_value(data, @@ -2670,6 +2672,8 @@ static int w83627ehf_resume(struct device *dev) if (data->reg_temp_hyst[i]) w83627ehf_write_temp(data, data->reg_temp_hyst[i], data->temp_max_hyst[i]); + if (i > 2) + continue; if (data->have_temp_offset & (1 << i)) w83627ehf_write_value(data, W83627EHF_REG_TEMP_OFFSET[i], |
