MR17v1 - programs/cmd: test that read is successful before using its result

[Alexandre Julliard (@julliard)]

Alexandre Julliard (@julliard) commented about programs/cmd/builtins.c:
>            (lstrcmpW(fd.cFileName, L"..") != 0) && (lstrcmpW(fd.cFileName, L".") != 0))
>        {
>          /* Allocate memory, add to list */
> -        DIRECTORY_STACK *toWalk = heap_xalloc(sizeof(DIRECTORY_STACK));
> +        DIRECTORY_STACK *toWalk;
> +        if (wcslen(dirsToWalk->dirName) + 1 + wcslen(fd.cFileName) >= MAX_PATH)
> +        {
> +            WINE_TRACE("Skipping too long path %ls\\%ls\n", dirsToWalk->dirName, fd.cFileName);
You'd want to use debugstr_w() to avoid debug buffer overflows.

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https://gitlab.winehq.org/wine/wine/-/merge_requests/17#note_522