On 2022/01/02 15:45, Dmitry Osipenko wrote:

26.12.2021 18:35, Hector Martin пишет:

quoted

-static char *brcm_alt_fw_path(const char *path, const char *board_type)
+static const char **brcm_alt_fw_paths(const char *path, const char *board_type)
 {
 	char alt_path[BRCMF_FW_NAME_LEN];
+	char **alt_paths;
 	char suffix[5];
 
 	strscpy(alt_path, path, BRCMF_FW_NAME_LEN);

@@ -609,27 +612,46 @@ static char *brcm_alt_fw_path(const char *path, const char *board_type)
 	strlcat(alt_path, board_type, BRCMF_FW_NAME_LEN);
 	strlcat(alt_path, suffix, BRCMF_FW_NAME_LEN);
 
-	return kstrdup(alt_path, GFP_KERNEL);
+	alt_paths = kzalloc(sizeof(char *) * 2, GFP_KERNEL);

array_size()?

Of what array?

quoted

+	alt_paths[0] = kstrdup(alt_path, GFP_KERNEL);
+
+	return (const char **)alt_paths;

Why this casting is needed?

Because implicit conversion from char ** to const char ** is not legal
in C, as that could cause const unsoundness if you do this:

char *foo[1];
const char **bar = foo;

bar[0] = "constant string";
foo[0][0] = '!'; // clobbers constant string

But it's fine in this case since the non-const pointer disappears so
nothing can ever write through it again.

-- 
Hector Martin (marcan@marcan.st)
Public Key: https://mrcn.st/pub