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| author | Arnd Bergmann <arnd@arndb.de> | 2016-10-25 17:55:04 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-11-13 10:08:32 +0100 |
| commit | d70674eeaa5efdefb99928691161578ae0a80316 (patch) | |
| tree | 7a89a59446a40d720a83a77b4dd92f1fd081bc44 | |
| parent | 68fae2f3df455f53d0dfe33483a49020b3b758f3 (diff) | |
| download | linux-d70674eeaa5efdefb99928691161578ae0a80316.tar.bz2 | |
iio: maxim_thermocouple: detect invalid storage size in read()
As found by gcc -Wmaybe-uninitialized, having a storage_bytes value other
than 2 or 4 will result in undefined behavior:
drivers/iio/temperature/maxim_thermocouple.c: In function 'maxim_thermocouple_read':
drivers/iio/temperature/maxim_thermocouple.c:141:5: error: 'ret' may be used uninitialized in this function [-Werror=maybe-uninitialized]
This probably cannot happen, but returning -EINVAL here is appropriate
and makes gcc happy and the code more robust.
Fixes: 231147ee77f3 ("iio: maxim_thermocouple: Align 16 bit big endian value of raw reads")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
(cherry picked from commit 32cb7d27e65df9daa7cee8f1fdf7b259f214bee2)
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/iio/temperature/maxim_thermocouple.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/iio/temperature/maxim_thermocouple.c b/drivers/iio/temperature/maxim_thermocouple.c index 066161a4bccd..f962f31a5eb2 100644 --- a/drivers/iio/temperature/maxim_thermocouple.c +++ b/drivers/iio/temperature/maxim_thermocouple.c @@ -136,6 +136,8 @@ static int maxim_thermocouple_read(struct maxim_thermocouple_data *data, ret = spi_read(data->spi, (void *)&buf32, storage_bytes); *val = be32_to_cpu(buf32); break; + default: + ret = -EINVAL; } if (ret) |