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Subject[PATCH 3/6] platform/chrome: cros_ec_proto: drop BUG_ON() in cros_ec_prepare_tx()
Date
It is overkill to crash the kernel if the given message is oversize.

Drop the BUG_ON() and return -EINVAL instead.

Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
---
drivers/platform/chrome/cros_ec_proto.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
index 2d6d3fbfa905..9ce3374846ff 100644
--- a/drivers/platform/chrome/cros_ec_proto.c
+++ b/drivers/platform/chrome/cros_ec_proto.c
@@ -60,7 +60,8 @@ static int prepare_packet(struct cros_ec_device *ec_dev,
int i;
u8 csum = 0;

- BUG_ON(msg->outsize + sizeof(*request) > ec_dev->dout_size);
+ if (msg->outsize + sizeof(*request) > ec_dev->dout_size)
+ return -EINVAL;

out = ec_dev->dout;
request = (struct ec_host_request *)out;
@@ -176,7 +177,9 @@ int cros_ec_prepare_tx(struct cros_ec_device *ec_dev,
if (ec_dev->proto_version > 2)
return prepare_packet(ec_dev, msg);

- BUG_ON(msg->outsize > EC_PROTO2_MAX_PARAM_SIZE);
+ if (msg->outsize > EC_PROTO2_MAX_PARAM_SIZE)
+ return -EINVAL;
+
out = ec_dev->dout;
out[0] = EC_CMD_VERSION0 + msg->version;
out[1] = msg->command;
--
2.36.0.512.ge40c2bad7a-goog
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