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[79.124.17.100]) by mx.google.com with ESMTP id l7si3184233ejo.498.2022.02.16.07.09.38; Wed, 16 Feb 2022 07:10:00 -0800 (PST) Received-SPF: pass (google.com: domain of ffmpeg-devel-bounces@ffmpeg.org designates 79.124.17.100 as permitted sender) client-ip=79.124.17.100; Authentication-Results: mx.google.com; dkim=neutral (body hash did not verify) header.i=@mailo.com header.s=mailo header.b=T8343Vbp; spf=pass (google.com: domain of ffmpeg-devel-bounces@ffmpeg.org designates 79.124.17.100 as permitted sender) smtp.mailfrom=ffmpeg-devel-bounces@ffmpeg.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=mailo.com Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id EF7CC68B06E; Wed, 16 Feb 2022 17:09:21 +0200 (EET) X-Original-To: ffmpeg-devel@ffmpeg.org Delivered-To: ffmpeg-devel@ffmpeg.org Received: from msg-6.mailo.com (ip-16.mailobj.net [213.182.54.16]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id AE98D68B1A0 for ; Wed, 16 Feb 2022 17:09:14 +0200 (EET) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=mailo.com; s=mailo; t=1645024151; bh=Yjx7eV17kp5L23zKB69r5J1UQAazjkTgmtV3lBgZbYg=; h=X-EA-Auth:From:To:Subject:Date:Message-Id:X-Mailer:In-Reply-To: References:MIME-Version:Content-Transfer-Encoding; b=T8343VbpyEXcW+KoIV5e+e+/lT0/SXRWI7t+uXGQ7RFSmv1WYFJF7JrtK7WY+4kf1 7QTuEYK97GxvPmQ5J3lKTFF7MgsYjGn/o/mBXshLd4re5Lo6K9ppWM7joe2Dr5qVnU ExpQgrYU7xKXChubtc/C31Ys4PL6spG8CDQDYdD8= Received: by b-1.in.mailobj.net [192.168.90.11] with ESMTP via ip-206.mailobj.net [213.182.55.206] Wed, 16 Feb 2022 16:09:11 +0100 (CET) X-EA-Auth: 1cfYSH6FlAJ+tWy87/+Umz0n83p+z2TQLIebqSGNQn1OKQFZtUq72nzHOAO0dkVA5GQcEmJUzSlCkixwKioE6ctVLHgKrkmYVPl1ohlk12Q= From: nihil-admirari To: ffmpeg-devel@ffmpeg.org Date: Wed, 16 Feb 2022 18:08:57 +0300 Message-Id: <20220216150859.16844-3-nil-admirari@mailo.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220216150859.16844-1-nil-admirari@mailo.com> References: <20220216150859.16844-1-nil-admirari@mailo.com> MIME-Version: 1.0 Subject: [FFmpeg-devel] [PATCH v3 3/5] compat/w32dlfcn.h: Replace MAX_PATH-sized buffers with dynamically sized ones X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: FFmpeg development discussions and patches Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" X-TUID: OX6gDGBFg/6d Also replaces a call to LoadLibraryExA with LoadLibraryExW since ANSI functions do not support long paths. --- compat/w32dlfcn.h | 74 ++++++++++++++++++++++++++++++++++++++--------- 1 file changed, 61 insertions(+), 13 deletions(-) diff --git a/compat/w32dlfcn.h b/compat/w32dlfcn.h index 52a94ef..a8ac780 100644 --- a/compat/w32dlfcn.h +++ b/compat/w32dlfcn.h @@ -25,6 +25,30 @@ #if (_WIN32_WINNT < 0x0602) || HAVE_WINRT #include "libavutil/wchar_filename.h" #endif + +static inline wchar_t *get_module_filename(const HMODULE module) +{ + wchar_t *path = NULL; + int path_size = 0, path_len = 0; + + do { + path_size = path_size ? 1.5 * path_size : MAX_PATH; + wchar_t *new_path = av_realloc_array(path, path_size, sizeof *path); + if (!new_path) { + av_free(path); + return NULL; + } + path = new_path; + path_len = GetModuleFileNameW(module, path, path_size); + } while (path_len && path_size <= 32768 && path_size <= path_len); + + if (!path_len) { + av_free(path); + return NULL; + } + return path; +} + /** * Safe function used to open dynamic libs. This attempts to improve program security * by removing the current directory from the dll search path. Only dll's found in the @@ -34,28 +58,50 @@ */ static inline HMODULE win32_dlopen(const char *name) { + wchar_t *name_w = NULL; + if (utf8towchar(name, &name_w)) + name_w = NULL; #if _WIN32_WINNT < 0x0602 // Need to check if KB2533623 is available if (!GetProcAddress(GetModuleHandleW(L"kernel32.dll"), "SetDefaultDllDirectories")) { HMODULE module = NULL; - wchar_t *path = NULL, *name_w = NULL; - DWORD pathlen; - if (utf8towchar(name, &name_w)) + wchar_t *path = NULL, *new_path = NULL; + DWORD pathlen, pathsize, namelen; + if (!name_w) goto exit; - path = (wchar_t *)av_calloc(MAX_PATH, sizeof(wchar_t)); + namelen = wcslen(name_w); // Try local directory first - pathlen = GetModuleFileNameW(NULL, path, MAX_PATH); - pathlen = wcsrchr(path, '\\') - path; - if (pathlen == 0 || pathlen + wcslen(name_w) + 2 > MAX_PATH) + path = get_module_filename(NULL); + if (!path) goto exit; - path[pathlen] = '\\'; + new_path = wcsrchr(path, '\\'); + if (!new_path) + goto exit; + pathlen = new_path - path; + pathsize = pathlen + namelen + 2; + new_path = av_realloc_array(path, pathsize, sizeof *path); + if (!new_path) + goto exit; + path = new_path; wcscpy(path + pathlen + 1, name_w); module = LoadLibraryExW(path, NULL, LOAD_WITH_ALTERED_SEARCH_PATH); if (module == NULL) { // Next try System32 directory - pathlen = GetSystemDirectoryW(path, MAX_PATH); - if (pathlen == 0 || pathlen + wcslen(name_w) + 2 > MAX_PATH) + pathlen = GetSystemDirectoryW(path, pathsize); + if (!pathlen) goto exit; + if (pathlen + namelen + 2 > pathsize) { + pathsize = pathlen + namelen + 2; + new_path = av_realloc_array(path, pathsize, sizeof *path); + if (!new_path) + goto exit; + path = new_path; + // The buffer might have been not enough for system directory + // in the first place. + pathlen = GetSystemDirectoryW(path, pathsize); + if (!pathlen) + goto exit; + } path[pathlen] = '\\'; wcscpy(path + pathlen + 1, name_w); module = LoadLibraryExW(path, NULL, LOAD_WITH_ALTERED_SEARCH_PATH); @@ -73,15 +119,17 @@ exit: # define LOAD_LIBRARY_SEARCH_SYSTEM32 0x00000800 #endif #if HAVE_WINRT - wchar_t *name_w = NULL; int ret; - if (utf8towchar(name, &name_w)) + if (!name_w) return NULL; ret = LoadPackagedLibrary(name_w, 0); av_free(name_w); return ret; #else - return LoadLibraryExA(name, NULL, LOAD_LIBRARY_SEARCH_APPLICATION_DIR | LOAD_LIBRARY_SEARCH_SYSTEM32); + /* filename may be be in CP_ACP */ + if (!name_w) + return LoadLibraryExA(name, NULL, LOAD_LIBRARY_SEARCH_APPLICATION_DIR | LOAD_LIBRARY_SEARCH_SYSTEM32); + return LoadLibraryExW(name_w, NULL, LOAD_LIBRARY_SEARCH_APPLICATION_DIR | LOAD_LIBRARY_SEARCH_SYSTEM32); #endif } #define dlopen(name, flags) win32_dlopen(name)