Hans Leidekker : wpcap: Fix an off-by-one error in convert_length_to_ipv6_mask().

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 90f53d681a2fbd0c9fcb9db33b50183688b61031
URL:    https://gitlab.winehq.org/wine/wine/-/commit/90f53d681a2fbd0c9fcb9db33b50183...

Author: Hans Leidekker 
Date:   Mon Feb  6 16:33:40 2023 +0100

wpcap: Fix an off-by-one error in convert_length_to_ipv6_mask().

---

dlls/wpcap/wpcap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dlls/wpcap/wpcap.c b/dlls/wpcap/wpcap.c
index 5494ed292e1..5c25e4a2708 100644
--- a/dlls/wpcap/wpcap.c
+++ b/dlls/wpcap/wpcap.c
@@ -444,7 +444,7 @@ static struct sockaddr *get_address( const IP_ADAPTER_UNICAST_ADDRESS *addr )
 static void convert_length_to_ipv6_mask( ULONG length, IN6_ADDR *mask )
 {
     unsigned int i;
-    for (i = 0; i < length / 8; i++) mask->u.Byte[i] = 0xff;
+    for (i = 0; i < length / 8 - 1; i++) mask->u.Byte[i] = 0xff;
     mask->u.Byte[i] = 0xff << (8 - length % 8);
 }