Hans Leidekker : bcrypt: Fix possible buffer overflow in export_gnutls_datum().

[Alexandre Julliard]

Module: wine
Branch: master
Commit: ffad823e34f1f940530f72b7e17583da22d39d93
URL:    https://gitlab.winehq.org/wine/wine/-/commit/ffad823e34f1f940530f72b7e17583d...

Author: Hans Leidekker <hans(a)codeweavers.com>
Date:   Wed Nov 16 16:51:08 2022 +0100

bcrypt: Fix possible buffer overflow in export_gnutls_datum().

---

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

diff --git a/dlls/bcrypt/gnutls.c b/dlls/bcrypt/gnutls.c
index fa4a0793cda..aeef64fd642 100644
--- a/dlls/bcrypt/gnutls.c
+++ b/dlls/bcrypt/gnutls.c
@@ -659,7 +659,7 @@ static ULONG export_gnutls_datum( UCHAR *buffer, ULONG buflen, gnutls_datum_t *d
         size = buflen;
     }
 
-    if (buffer) memcpy( buffer + offset, src, size );
+    if (buffer) memcpy( buffer + offset, src, size - offset );
     return size;
 }