[PATCH] rpmsg: glink: Use struct_size() helper

From: Gustavo A. R. Silva
Date: Thu Aug 29 2019 - 14:22:03 EST

One of the more common cases of allocation size calculations is finding
the size of a structure that has a zero-sized array at the end, along
with memory for some number of elements for that array. For example:

struct {
struct intent_pair intents[];
} __packed * msg;

Make use of the struct_size() helper instead of an open-coded version
in order to avoid any potential type mistakes.

So, replace the following form:

sizeof(*msg) + sizeof(struct intent_pair) * count


struct_size(msg, intents, count)

This code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gustavo@xxxxxxxxxxxxxx>
drivers/rpmsg/qcom_glink_native.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c
index f46c787733e8..621f1afd4d6b 100644
--- a/drivers/rpmsg/qcom_glink_native.c
+++ b/drivers/rpmsg/qcom_glink_native.c
@@ -892,7 +892,7 @@ static void qcom_glink_handle_intent(struct qcom_glink *glink,
struct intent_pair intents[];
} __packed * msg;

- const size_t msglen = sizeof(*msg) + sizeof(struct intent_pair) * count;
+ const size_t msglen = struct_size(msg, intents, count);
int ret;
int i;
unsigned long flags;