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[v4,18/21] platform/chrome: cros_ec_proto: handle empty payload in getting cmd mask

Message ID 20220609084957.3684698-19-tzungbi@kernel.org (mailing list archive)
State Accepted
Commit aac29b04dc3fdc5b95bca31413d90dbe8c1ae33d
Headers show
Series platform/chrome: Kunit tests and refactor for cros_ec_query_all() | expand

Commit Message

Tzung-Bi Shih June 9, 2022, 8:49 a.m. UTC 
cros_ec_get_host_command_version_mask() expects to receive
sizeof(struct ec_response_get_cmd_versions) 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_host_command_version_mask().

Reviewed-by: Guenter Roeck <groeck@chromium.org>
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
---
Changes from v3:
- Add R-b tag.

 drivers/platform/chrome/cros_ec_proto.c | 5 +++++
 1 file changed, 5 insertions(+)
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Patch

diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
index ac445bbbd060..28c103315144 100644
--- a/drivers/platform/chrome/cros_ec_proto.c
+++ b/drivers/platform/chrome/cros_ec_proto.c
@@ -458,6 +458,11 @@  static int cros_ec_get_host_command_version_mask(struct cros_ec_device *ec_dev,
 		goto exit;
 	}
 
+	if (ret == 0) {
+		ret = -EPROTO;
+		goto exit;
+	}
+
 	rver = (struct ec_response_get_cmd_versions *)msg->data;
 	*mask = rver->version_mask;
 	ret = 0;