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platform/chrome: cros_ec_proto: handle empty payload in getting proto info

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cros_ec_get_proto_info() expects to receive
sizeof(struct ec_response_get_protocol_info) from send_command().  The
payload is valid only if the return value is positive.

Return -EPROTO if send_command() returns 0 in cros_ec_get_proto_info().

Reviewed-by: Guenter Roeck <groeck@chromium.org>
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
Link: https://lore.kernel.org/r/20220609084957.3684698-10-tzungbi@kernel.org
This commit is contained in:
Tzung-Bi Shih 2022-06-09 08:49:45 +00:00
parent 3e97581ed9
commit 878c36f6ca
1 changed files with 5 additions and 0 deletions
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5
drivers/platform/chrome/cros_ec_proto.c
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@ -314,6 +314,11 @@ static int cros_ec_get_proto_info(struct cros_ec_device *ec_dev, int devidx)
goto exit;
}
if (ret == 0) {
ret = -EPROTO;
goto exit;
}
info = (struct ec_response_get_protocol_info *)msg->data;
switch (devidx) {