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ASoC: cros_ec_codec: remove null pointer dereference warning

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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@linux.intel.com>
Acked-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Link: https://lore.kernel.org/r/20210312182246.5153-5-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Pierre-Louis Bossart 2021-03-12 12:22:27 -06:00 committed by Mark Brown
parent 5b349c8f35
commit 157c4df677
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 1 additions and 1 deletions
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2
sound/soc/codecs/cros_ec_codec.c
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@ -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;