Alex Henrie : msi: Fix memory leak on realloc failure in msi_get_window_text (cppcheck).

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 6c1dd0f2c5669e084eb1f84571c38761a97c0970
URL:    https://gitlab.winehq.org/wine/wine/-/commit/6c1dd0f2c5669e084eb1f84571c3876...

Author: Alex Henrie 
Date:   Sun Dec 11 21:28:03 2022 -0700

msi: Fix memory leak on realloc failure in msi_get_window_text (cppcheck).

---

dlls/msi/dialog.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/dlls/msi/dialog.c b/dlls/msi/dialog.c
index e5a2208cb6f..cfd39d4921c 100644
--- a/dlls/msi/dialog.c
+++ b/dlls/msi/dialog.c
@@ -143,7 +143,7 @@ static HWND hMsiHiddenWindow;
 static LPWSTR msi_get_window_text( HWND hwnd )
 {
     UINT sz, r;
-    LPWSTR buf;
+    WCHAR *buf, *new_buf;

sz = 0x20;
     buf = malloc( sz * sizeof(WCHAR) );
@@ -153,7 +153,10 @@ static LPWSTR msi_get_window_text( HWND hwnd )
         if ( r < (sz - 1) )
             break;
         sz *= 2;
-        buf = realloc( buf, sz * sizeof(WCHAR) );
+        new_buf = realloc( buf, sz * sizeof(WCHAR) );
+        if ( !new_buf )
+            free( buf );
+        buf = new_buf;
     }

return buf;