staging: wlan-ng: replace strncpy() with strscpy()

Checkpatch suggests the use of strscpy() instead of strncpy().
The advantages are that it always adds a NUL terminator and it prevents
a read overflow if the src string is not properly terminated. One
potential disadvantage is that it doesn't zero pad the string like
strncpy() does.
In this code, strscpy() and strncpy() are equivalent and it does not
affect runtime behavior. The string is zeroed on the line before
using memset(). The resulting string was always NUL terminated and
PRISM2_USB_FWFILE is string literal "prism2_ru.fw" so it's NUL
terminated.
However, even though using strscpy() does not fix any bugs, it's
still nicer and makes checkpatch happy.

Signed-off-by: Calvince Otieno <calvncce@gmail.com>
Reviewed-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://lore.kernel.org/r/ZSzapU+eKWvHVwxi@lab-ubuntu
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/wlan-ng/prism2fw.c b/drivers/staging/wlan-ng/prism2fw.c
index 5d03b2b9aab40a89444844a6c217da11594172d3..3ccd110416460ee15e8ec8d7e6e66b0fd242f6dc 100644 (file)
--- a/drivers/staging/wlan-ng/prism2fw.c
+++ b/drivers/staging/wlan-ng/prism2fw.c
@@ -725,7 +725,7 @@ static int plugimage(struct imgchunk *fchunk, unsigned int nfchunks,
 
                if (j == -1) {  /* plug the filename */
                        memset(dest, 0, s3plug[i].len);
-                       strncpy(dest, PRISM2_USB_FWFILE, s3plug[i].len - 1);
+                       strscpy(dest, PRISM2_USB_FWFILE, s3plug[i].len);
                } else {        /* plug a PDR */
                        memcpy(dest, &pda->rec[j]->data, s3plug[i].len);
                }