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urlmon: Correctly fix IStream::Read. 

Don't dereference a possible NULL pointer.
This commit is contained in:
Thomas Weidenmueller 2005-12-12 11:49:29 +01:00 committed by Alexandre Julliard
parent c26ad82e75
commit ac459e7ea0
1 changed files with 5 additions and 2 deletions
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7
dlls/urlmon/umstream.c
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@ -225,7 +225,7 @@ static HRESULT WINAPI IStream_fnRead (IStream * iface,
ULONG cb,
ULONG* pcbRead)
{
DWORD dwBytesRead;
ULONG dwBytesRead;
IUMCacheStream *This = (IUMCacheStream *)iface;
TRACE("(%p)->(%p,0x%08lx,%p)\n",This, pv, cb, pcbRead);
@ -233,7 +233,10 @@ static HRESULT WINAPI IStream_fnRead (IStream * iface,
if ( !pv )
return STG_E_INVALIDPOINTER;
if ( ! ReadFile( This->handle, pv, cb, (pcbRead ? pcbRead : &dwBytesRead), NULL ) )
if ( !pcbRead)
pcbRead = &dwBytesRead;
if ( ! ReadFile( This->handle, pv, cb, (LPDWORD)pcbRead, NULL ) )
return S_FALSE;
if (!*pcbRead)