Marcus Meissner : wininet: Fixed memory corruption in urlcache.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: cb80692cf86ef133a75d47b569568b43caee59a3
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=cb80692cf86ef133a75d47b569568b43caee59a3

Author: Marcus Meissner <marcus at jet.franken.de>
Date:   Sun Apr  5 13:55:21 2009 +0200

wininet: Fixed memory corruption in urlcache.

---

 dlls/wininet/urlcache.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/dlls/wininet/urlcache.c b/dlls/wininet/urlcache.c
index bf67fec..b4feba3 100644
--- a/dlls/wininet/urlcache.c
+++ b/dlls/wininet/urlcache.c
@@ -995,11 +995,13 @@ static DWORD URLCache_CopyEntry(
     /* FIXME: is source url optional? */
     if (*lpdwBufferSize >= dwRequiredSize)
     {
-        lpCacheEntryInfo->lpszSourceUrlName = (LPSTR)lpCacheEntryInfo + dwRequiredSize - lenUrl - 1;
+        DWORD lenUrlBytes = (lenUrl+1) * (bUnicode ? sizeof(WCHAR) : sizeof(CHAR));
+
+        lpCacheEntryInfo->lpszSourceUrlName = (LPSTR)lpCacheEntryInfo + dwRequiredSize - lenUrlBytes;
         if (bUnicode)
             MultiByteToWideChar(CP_ACP, 0, (LPSTR)pUrlEntry + pUrlEntry->dwOffsetUrl, -1, (LPWSTR)lpCacheEntryInfo->lpszSourceUrlName, lenUrl + 1);
         else
-            memcpy(lpCacheEntryInfo->lpszSourceUrlName, (LPSTR)pUrlEntry + pUrlEntry->dwOffsetUrl, (lenUrl + 1) * sizeof(CHAR));
+            memcpy(lpCacheEntryInfo->lpszSourceUrlName, (LPSTR)pUrlEntry + pUrlEntry->dwOffsetUrl, lenUrlBytes);
     }
 
     if ((dwRequiredSize % 4) && (dwRequiredSize < *lpdwBufferSize))