Messages in this thread | | | Subject | Re: [PATCH 04/23] ASoC: cros_ec_codec: remove null pointer dereference warning | From | Enric Balletbo i Serra <> | Date | Mon, 15 Mar 2021 11:39:27 +0100 |
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Hi Pierre-Louis,
Thank you for you patch.
On 12/3/21 19:22, Pierre-Louis Bossart wrote: > 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>
Looks good to me, so
Acked-by: Enric Balletbo i Serra <enric.balletbo@collabora.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; >
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