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Subject[PATCH v4 21/21] platform/chrome: cros_ec_proto: handle empty payload in getting wake mask
Date
cros_ec_get_host_event_wake_mask() expects to receive
sizeof(struct ec_response_host_event_mask) 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_event_wake_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 | 24 ++++++++++++++----------
1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
index 760a6da0965a..ef942e8d0e8f 100644
--- a/drivers/platform/chrome/cros_ec_proto.c
+++ b/drivers/platform/chrome/cros_ec_proto.c
@@ -256,19 +256,23 @@ static int cros_ec_get_host_event_wake_mask(struct cros_ec_device *ec_dev, uint3
msg->insize = sizeof(*r);

ret = send_command(ec_dev, msg);
- if (ret >= 0) {
- mapped = cros_ec_map_error(msg->result);
- if (mapped) {
- ret = mapped;
- goto exit;
- }
+ if (ret < 0)
+ goto exit;
+
+ mapped = cros_ec_map_error(msg->result);
+ if (mapped) {
+ ret = mapped;
+ goto exit;
}
- if (ret > 0) {
- r = (struct ec_response_host_event_mask *)msg->data;
- *mask = r->mask;
- ret = 0;
+
+ if (ret == 0) {
+ ret = -EPROTO;
+ goto exit;
}

+ r = (struct ec_response_host_event_mask *)msg->data;
+ *mask = r->mask;
+ ret = 0;
exit:
kfree(msg);
return ret;
--
2.36.1.255.ge46751e96f-goog
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