[PATCH 04/23] ASoC: cros_ec_codec: remove null pointer dereference warning

[Pierre-Louis Bossart]

Cppcheck complains of a possible issue:

sound/soc/codecs/cros_ec_codec.c:98:10: warning: Possible null pointer
dereference: in [nullPointer]
  memcpy(in, msg->data, insize);
         ^
sound/soc/codecs/cros_ec_codec.c:162:34: note: Calling function
'send_ec_host_command', 5th argument 'NULL' value is 0
       (uint8_t *)&p, sizeof(p), NULL, 0);
                                 ^
sound/soc/codecs/cros_ec_codec.c:98:10: note: Null pointer dereference
  memcpy(in, msg->data, insize);
         ^

In practice the access to the pointer is protected by another
argument, but this is likely to fool other static analysis tools. Add
a test to avoid doing the memcpy if the pointer is NULL or the size is
zero.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
---
 sound/soc/codecs/cros_ec_codec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/codecs/cros_ec_codec.c b/sound/soc/codecs/cros_ec_codec.c
index c4772f82485a..a201d652aca2 100644
--- a/sound/soc/codecs/cros_ec_codec.c
+++ b/sound/soc/codecs/cros_ec_codec.c
@@ -94,7 +94,7 @@ static int send_ec_host_command(struct cros_ec_device *ec_dev, uint32_t cmd,
 	if (ret < 0)
 		goto error;
 
-	if (insize)
+	if (in && insize)
 		memcpy(in, msg->data, insize);
 
 	ret = 0;
-- 
2.25.1