cmd: Don't crash on 'if exist' without parameter.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=51598Signed-off-by: Eric Pouech <eric.pouech@gmail.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

cmd: Don't crash on 'if exist' without parameter.
535da775 · Eric Pouech · Alexandre Julliard · 488a00c3 · 535da775
Commit 535da775 authored Dec 20, 2021 by Eric Pouech Committed by Alexandre Julliard Dec 20, 2021
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builtins.c programs/cmd/builtins.c +2 -1

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--- a/programs/cmd/builtins.c
+++ b/programs/cmd/builtins.c
@@ -2811,8 +2811,9 @@ int evaluate_if_condition(WCHAR *p, WCHAR **command, int *test, int *negate)
    WCHAR *param = WCMD_parameter(p, 1+(*negate), NULL, FALSE, FALSE);
    int    len = lstrlenW(param);

+    if (!len) goto syntax_err;
    /* FindFirstFile does not like a directory path ending in '\', append a '.' */
-    if (len && param[len-1] == '\\') lstrcatW(param, L".");
+    if (param[len-1] == '\\') lstrcatW(param, L".");

    hff = FindFirstFileW(param, &fd);
    *test = (hff != INVALID_HANDLE_VALUE );