Damjan Jovanovic : wininet: The buffer is returned from InternetGetLastResponseInfo() even when the error is 0.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 0f958ec3b0518f65cc5a57a2c2dda49986a6ec39
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=0f958ec3b0518f65cc5a57a2c...

Author: Damjan Jovanovic 
Date:   Tue Jul  6 20:24:19 2021 +0200

wininet: The buffer is returned from InternetGetLastResponseInfo() even when the error is 0.

Signed-off-by: Damjan Jovanovic 
Signed-off-by: Jacek Caban 
Signed-off-by: Alexandre Julliard

---

dlls/wininet/internet.c  | 8 ++------
 dlls/wininet/tests/ftp.c | 6 ++++++
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/dlls/wininet/internet.c b/dlls/wininet/internet.c
index a38326d8fb1..cef151c7bf2 100644
--- a/dlls/wininet/internet.c
+++ b/dlls/wininet/internet.c
@@ -1099,14 +1099,12 @@ BOOL WINAPI InternetGetLastResponseInfoA(LPDWORD lpdwError,
             return FALSE;
         }
         *lpdwError = lpwite->dwError;
-        if (lpwite->dwError && *lpdwBufferLength)
+        if (*lpdwBufferLength)
         {
             memcpy(lpszBuffer, lpwite->response, *lpdwBufferLength);
             lpszBuffer[*lpdwBufferLength - 1] = 0;
             *lpdwBufferLength = strlen(lpszBuffer);
         }
-        else
-            *lpdwBufferLength = 0;
     }
     else
     {
@@ -1149,10 +1147,8 @@ BOOL WINAPI InternetGetLastResponseInfoW(LPDWORD lpdwError,
             return FALSE;
         }
         *lpdwError = lpwite->dwError;
-        if (lpwite->dwError && *lpdwBufferLength)
+        if (*lpdwBufferLength)
             *lpdwBufferLength = MultiByteToWideChar(CP_ACP, 0, lpwite->response, -1, lpszBuffer, *lpdwBufferLength);
-        else
-            *lpdwBufferLength = 0;
     }
     else
     {
diff --git a/dlls/wininet/tests/ftp.c b/dlls/wininet/tests/ftp.c
index 16fbbcb2ed3..c7c4febf379 100644
--- a/dlls/wininet/tests/ftp.c
+++ b/dlls/wininet/tests/ftp.c
@@ -706,6 +706,8 @@ static void test_command(HINTERNET hFtp)
     BOOL ret;
     DWORD error;
     unsigned int i;
+    BOOL had_error_zero = FALSE;
+    BOOL had_error_zero_size_positive = FALSE;
     static const struct
     {
         BOOL  ret;
@@ -776,8 +778,12 @@ static void test_command(HINTERNET hFtp)
         ret = InternetGetLastResponseInfoA(&error, buffer, &size);
         ok(ret, "%d: got ret %d\n", i, ret);
         ok(size == 0 || strlen(buffer) == size, "%d: size %d, buffer size %d\n", i, size, size ? strlen(buffer) : 0);
+        had_error_zero |= (error == 0);
+        had_error_zero_size_positive |= (error == 0 && size > 0);
         HeapFree(GetProcessHeap(), 0, buffer);
     }
+
+    ok(!had_error_zero || had_error_zero_size_positive, "never observed error 0 with positive size\n");
 }

static void test_find_first_file(HINTERNET hFtp, HINTERNET hConnect)