Patch "wifi: ray_cs: Utilize strnlen() in parse_addr()" has been added to the 4.19-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    wifi: ray_cs: Utilize strnlen() in parse_addr()

to the 4.19-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     wifi-ray_cs-utilize-strnlen-in-parse_addr.patch
and it can be found in the queue-4.19 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 39183f28dd2fa490bf43101f1f9693db74661545
Author: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Date:   Fri Jun 3 19:44:13 2022 +0300

    wifi: ray_cs: Utilize strnlen() in parse_addr()
    
    [ Upstream commit 9e8e9187673cb24324f9165dd47b2b28f60b0b10 ]
    
    Instead of doing simple operations and using an additional variable on stack,
    utilize strnlen() and reuse len variable.
    
    Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
    Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxx>
    Link: https://lore.kernel.org/r/20220603164414.48436-1-andriy.shevchenko@xxxxxxxxxxxxxxx
    Stable-dep-of: 4f8d66a9fb2e ("wifi: ray_cs: Fix an error handling path in ray_probe()")
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/net/wireless/ray_cs.c b/drivers/net/wireless/ray_cs.c
index 8704bae39e1bf..f15714f19d0ff 100644
--- a/drivers/net/wireless/ray_cs.c
+++ b/drivers/net/wireless/ray_cs.c
@@ -1651,31 +1651,29 @@ static void authenticate_timeout(struct timer_list *t)
 /*===========================================================================*/
 static int parse_addr(char *in_str, UCHAR *out)
 {
+	int i, k;
 	int len;
-	int i, j, k;
 	int status;
 
 	if (in_str == NULL)
 		return 0;
-	if ((len = strlen(in_str)) < 2)
+	len = strnlen(in_str, ADDRLEN * 2 + 1) - 1;
+	if (len < 1)
 		return 0;
 	memset(out, 0, ADDRLEN);
 
 	status = 1;
-	j = len - 1;
-	if (j > 12)
-		j = 12;
 	i = 5;
 
-	while (j > 0) {
-		if ((k = hex_to_bin(in_str[j--])) != -1)
+	while (len > 0) {
+		if ((k = hex_to_bin(in_str[len--])) != -1)
 			out[i] = k;
 		else
 			return 0;
 
-		if (j == 0)
+		if (len == 0)
 			break;
-		if ((k = hex_to_bin(in_str[j--])) != -1)
+		if ((k = hex_to_bin(in_str[len--])) != -1)
 			out[i] += k << 4;
 		else
 			return 0;