Subject: [PATCH][next] Bluetooth: Use struct_size() helper

From: "Gustavo A. R. Silva" <[email-masked]>
Date: Thu, 28 Mar 2019 12:30:29 -0500

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 foo {
    int stuff;
    struct boo entry[];
};

size = sizeof(struct foo) + count * sizeof(struct boo);

Instead of leaving these open-coded and prone to type mistakes, we can
now use the new struct_size() helper:

size = struct_size(instance, entry, count);

This code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <[email-masked]>
---
 net/bluetooth/mgmt.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 2457f408d17d..150114e33b20 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -2301,8 +2301,7 @@ static int load_link_keys(struct sock *sk, struct hci_dev *hdev, void *data,
 				       MGMT_STATUS_INVALID_PARAMS);
 	}
 
-	expected_len = sizeof(*cp) + key_count *
-					sizeof(struct mgmt_link_key_info);
+	expected_len = struct_size(cp, keys, key_count);
 	if (expected_len != len) {
 		bt_dev_err(hdev, "load_link_keys: expected %u bytes, got %u bytes",
 			   expected_len, len);
@@ -5030,7 +5029,7 @@ static int load_irks(struct sock *sk, struct hci_dev *hdev, void *cp_data,
 				       MGMT_STATUS_INVALID_PARAMS);
 	}
 
-	expected_len = sizeof(*cp) + irk_count * sizeof(struct mgmt_irk_info);
+	expected_len = struct_size(cp, irks, irk_count);
 	if (expected_len != len) {
 		bt_dev_err(hdev, "load_irks: expected %u bytes, got %u bytes",
 			   expected_len, len);
@@ -5112,8 +5111,7 @@ static int load_long_term_keys(struct sock *sk, struct hci_dev *hdev,
 				       MGMT_STATUS_INVALID_PARAMS);
 	}
 
-	expected_len = sizeof(*cp) + key_count *
-					sizeof(struct mgmt_ltk_info);
+	expected_len = struct_size(cp, keys, key_count);
 	if (expected_len != len) {
 		bt_dev_err(hdev, "load_keys: expected %u bytes, got %u bytes",
 			   expected_len, len);
@@ -5847,8 +5845,7 @@ static int load_conn_param(struct sock *sk, struct hci_dev *hdev, void *data,
 				       MGMT_STATUS_INVALID_PARAMS);
 	}
 
-	expected_len = sizeof(*cp) + param_count *
-					sizeof(struct mgmt_conn_param);
+	expected_len = struct_size(cp, params, param_count);
 	if (expected_len != len) {
 		bt_dev_err(hdev, "load_conn_param: expected %u bytes, got %u bytes",
 			   expected_len, len);
-- 
2.21.0