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[31.211.229.121]) by smtp.gmail.com with ESMTPSA id k3-v6sm188706lja.8.2019.01.22.13.46.03 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 22 Jan 2019 13:46:03 -0800 (PST) From: =?utf-8?q?Martin_=C3=85gren?= To: git@vger.kernel.org Cc: Jeff King , "brian m . carlson" Subject: [PATCH v3 1/2] setup: free old value before setting `work_tree` Date: Tue, 22 Jan 2019 22:45:47 +0100 Message-Id: <5be3e4fb47f534e7b1467c1d844996bcd1121ca0.1548186510.git.martin.agren@gmail.com> X-Mailer: git-send-email 2.20.1.98.gecbdaf0899 In-Reply-To: References: MIME-Version: 1.0 Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Before assigning to `data->work_tree` in `read_worktree_config()`, free any value we might already have picked up, so that we do not leak it. Signed-off-by: Martin Ågren Signed-off-by: Junio C Hamano --- setup.c | 1 + 1 file changed, 1 insertion(+) diff --git a/setup.c b/setup.c index 1be5037f12..bb633942bb 100644 --- a/setup.c +++ b/setup.c @@ -411,6 +411,7 @@ static int read_worktree_config(const char *var, const char *value, void *vdata) } else if (strcmp(var, "core.worktree") == 0) { if (!value) return config_error_nonbool(var); + free(data->work_tree); data->work_tree = xstrdup(value); } return 0; From patchwork Tue Jan 22 21:45:48 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Martin_=C3=85gren?= X-Patchwork-Id: 10776323 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4F0171390 for ; Tue, 22 Jan 2019 21:46:13 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3E88C2AC31 for ; Tue, 22 Jan 2019 21:46:13 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 32A2B2AC77; Tue, 22 Jan 2019 21:46:13 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6B1C92AC3E for ; Tue, 22 Jan 2019 21:46:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726744AbfAVVqL (ORCPT ); Tue, 22 Jan 2019 16:46:11 -0500 Received: from mail-lf1-f66.google.com ([209.85.167.66]:39212 "EHLO mail-lf1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726724AbfAVVqL (ORCPT ); Tue, 22 Jan 2019 16:46:11 -0500 Received: by mail-lf1-f66.google.com with SMTP id n18so44482lfh.6 for ; Tue, 22 Jan 2019 13:46:08 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=ybYAMtx+ksqBvxqqjTGVAqWnJ1AGNl0k/geEXPeKJOM=; b=HCFLi6cgLy/ZtvNcdDrE3Q7RQ/eVjXgqxJb04AQ1P9rFwZnxyg8FYMHSg0N49c8HkZ 7r7La/G9oA1gxFbo2LL+EKZo/Bemr9obPOjK6d9WPFLGpi3msX6lXhOyUXEUm5eA4cE3 XcusY3vr9xodNKyAaG3yVlyoQL6PEulPIg1cKAafwIsPW3v4rc+V+P0IB4bITSMjuiM+ S00itA9zpd8oL90C+4aFqANoJAyt6j56yYoxmPsvLDBz78YNgl6EzZvyrqnTR5XwNPhS yI7VP4RLvO0S+jK119I34O/ObfWvamFy6fnzZIKukoFP42k1MKuC1XjMGsG/j21gkGyW eAYQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=ybYAMtx+ksqBvxqqjTGVAqWnJ1AGNl0k/geEXPeKJOM=; b=dV1h85jFh+OdKNRirFtjVKNbrRnFaU1EotC0dK3VJLTQWL20qp6foNWXZleli+PX/q KPldxY4WFoJ6ksJlWvBhd7imLGVbrSohC6JgOAn4vStkKdNYmIF+DgJlqUyS0KJQcqPV nDlEsRCfja4LRY4+1/fgOJCNSKrZxTZhkXsNaaor8ZHU9xEeSWP9T35VPn1+XSYrED2x A0iNd4UpJsMk8wkpVfb9W/OJMC/GEvadSwJuIs/qetautCt0IvdRCHRB9imwasflGP/m OIkQOboMvDHMFo1ryhyvt5bN6BjbMMGffzTyE0Z6eLCpbTLJYNs0N9KuqhCXolRCSCvo dRUA== X-Gm-Message-State: AJcUukeypVwoEON+ZPDLM4jbB2PPHMJuXKicP1O3ie4wiPZm1pwr+ANl EiTv5kzz5lBsGpbOvOzx82OJx8fP X-Google-Smtp-Source: ALg8bN5jRcog89xB8jB2HPAF4Fjin8rzfBVQylROATU5cUlXxenHZRkOKZvdNbskNQq+sLEACU3nLQ== X-Received: by 2002:ac2:55a3:: with SMTP id y3mr20778329lfg.93.1548193567569; Tue, 22 Jan 2019 13:46:07 -0800 (PST) Received: from localhost.localdomain (31-211-229-121.customers.ownit.se. [31.211.229.121]) by smtp.gmail.com with ESMTPSA id k3-v6sm188706lja.8.2019.01.22.13.46.06 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 22 Jan 2019 13:46:06 -0800 (PST) From: =?utf-8?q?Martin_=C3=85gren?= To: git@vger.kernel.org Cc: Jeff King , "brian m . carlson" Subject: [PATCH v3 2/2] setup: fix memory leaks with `struct repository_format` Date: Tue, 22 Jan 2019 22:45:48 +0100 Message-Id: X-Mailer: git-send-email 2.20.1.98.gecbdaf0899 In-Reply-To: References: MIME-Version: 1.0 Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP After we set up a `struct repository_format`, it owns various pieces of allocated memory. We then either use those members, because we decide we want to use the "candidate" repository format, or we discard the candidate / scratch space. In the first case, we transfer ownership of the memory to a few global variables. In the latter case, we just silently drop the struct and end up leaking memory. Introduce an initialization macro `REPOSITORY_FORMAT_INIT` and a function `clear_repository_format()`, to be used on each side of `read_repository_format()`. To have a clear and simple memory ownership, let all users of `struct repository_format` duplicate the strings that they take from it, rather than stealing the pointers. Call `clear_...()` at the start of `read_...()` instead of just zeroing the struct, since we sometimes enter the function multiple times. This means that it is important to initialize the struct before calling `read_...()`, so document that. Teach `read_...()` to clear the struct upon an error, so that it is reset to a safe state, and document this. About that very last point: In `setup_git_directory_gently()`, we look at `repo_fmt.hash_algo` even if `repo_fmt.version` is -1, which we weren't actually supposed to do per the API. After this commit, that's ok. We inherit the existing code's combining "error" and "no version found". Both are signalled through `version == -1` and now both cause us to clear any partial configuration we have picked up. For "extensions.*", that's fine, since they require a positive version number. For "core.bare" and "core.worktree", we're already verifying that we have a non-negative version number before using them. Signed-off-by: Martin Ågren --- cache.h | 27 ++++++++++++++++++++++++--- builtin/init-db.c | 3 ++- repository.c | 3 ++- setup.c | 32 ++++++++++++++++++++------------ worktree.c | 4 +++- 5 files changed, 51 insertions(+), 18 deletions(-) diff --git a/cache.h b/cache.h index ca36b44ee0..ec7c043412 100644 --- a/cache.h +++ b/cache.h @@ -972,14 +972,35 @@ struct repository_format { struct string_list unknown_extensions; }; +/* + * Always use this to initialize a `struct repository_format` + * to a well-defined, default state before calling + * `read_repository()`. + */ +#define REPOSITORY_FORMAT_INIT \ +{ \ + .version = -1, \ + .is_bare = -1, \ + .hash_algo = GIT_HASH_SHA1, \ + .unknown_extensions = STRING_LIST_INIT_DUP, \ +} + /* * Read the repository format characteristics from the config file "path" into - * "format" struct. Returns the numeric version. On error, -1 is returned, - * format->version is set to -1, and all other fields in the struct are - * undefined. + * "format" struct. Returns the numeric version. On error, or if no version is + * found in the configuration, -1 is returned, format->version is set to -1, + * and all other fields in the struct are set to the default configuration + * (REPOSITORY_FORMAT_INIT). Always initialize the struct using + * REPOSITORY_FORMAT_INIT before calling this function. */ int read_repository_format(struct repository_format *format, const char *path); +/* + * Free the memory held onto by `format`, but not the struct itself. + * (No need to use this after `read_repository_format()` fails.) + */ +void clear_repository_format(struct repository_format *format); + /* * Verify that the repository described by repository_format is something we * can read. If it is, return 0. Otherwise, return -1, and "err" will describe diff --git a/builtin/init-db.c b/builtin/init-db.c index 41faffd28d..04c60eaad5 100644 --- a/builtin/init-db.c +++ b/builtin/init-db.c @@ -96,7 +96,7 @@ static void copy_templates(const char *template_dir) struct strbuf path = STRBUF_INIT; struct strbuf template_path = STRBUF_INIT; size_t template_len; - struct repository_format template_format; + struct repository_format template_format = REPOSITORY_FORMAT_INIT; struct strbuf err = STRBUF_INIT; DIR *dir; char *to_free = NULL; @@ -148,6 +148,7 @@ static void copy_templates(const char *template_dir) free(to_free); strbuf_release(&path); strbuf_release(&template_path); + clear_repository_format(&template_format); } static int git_init_db_config(const char *k, const char *v, void *cb) diff --git a/repository.c b/repository.c index 7b02e1dffa..df88705574 100644 --- a/repository.c +++ b/repository.c @@ -148,7 +148,7 @@ int repo_init(struct repository *repo, const char *gitdir, const char *worktree) { - struct repository_format format; + struct repository_format format = REPOSITORY_FORMAT_INIT; memset(repo, 0, sizeof(*repo)); repo->objects = raw_object_store_new(); @@ -165,6 +165,7 @@ int repo_init(struct repository *repo, if (worktree) repo_set_worktree(repo, worktree); + clear_repository_format(&format); return 0; error: diff --git a/setup.c b/setup.c index bb633942bb..14c2f8ce24 100644 --- a/setup.c +++ b/setup.c @@ -477,7 +477,7 @@ static int check_repository_format_gently(const char *gitdir, struct repository_ } repository_format_precious_objects = candidate->precious_objects; - repository_format_partial_clone = candidate->partial_clone; + repository_format_partial_clone = xstrdup_or_null(candidate->partial_clone); repository_format_worktree_config = candidate->worktree_config; string_list_clear(&candidate->unknown_extensions, 0); @@ -500,11 +500,9 @@ static int check_repository_format_gently(const char *gitdir, struct repository_ } if (candidate->work_tree) { free(git_work_tree_cfg); - git_work_tree_cfg = candidate->work_tree; + git_work_tree_cfg = xstrdup(candidate->work_tree); inside_work_tree = -1; } - } else { - free(candidate->work_tree); } return 0; @@ -512,15 +510,21 @@ static int check_repository_format_gently(const char *gitdir, struct repository_ int read_repository_format(struct repository_format *format, const char *path) { - memset(format, 0, sizeof(*format)); - format->version = -1; - format->is_bare = -1; - format->hash_algo = GIT_HASH_SHA1; - string_list_init(&format->unknown_extensions, 1); + clear_repository_format(format); git_config_from_file(check_repo_format, path, format); + if (format->version == -1) + clear_repository_format(format); return format->version; } +void clear_repository_format(struct repository_format *format) +{ + string_list_clear(&format->unknown_extensions, 0); + free(format->work_tree); + free(format->partial_clone); + *format = (struct repository_format)REPOSITORY_FORMAT_INIT; +} + int verify_repository_format(const struct repository_format *format, struct strbuf *err) { @@ -1008,7 +1012,7 @@ int discover_git_directory(struct strbuf *commondir, struct strbuf dir = STRBUF_INIT, err = STRBUF_INIT; size_t gitdir_offset = gitdir->len, cwd_len; size_t commondir_offset = commondir->len; - struct repository_format candidate; + struct repository_format candidate = REPOSITORY_FORMAT_INIT; if (strbuf_getcwd(&dir)) return -1; @@ -1045,9 +1049,11 @@ int discover_git_directory(struct strbuf *commondir, strbuf_release(&err); strbuf_setlen(commondir, commondir_offset); strbuf_setlen(gitdir, gitdir_offset); + clear_repository_format(&candidate); return -1; } + clear_repository_format(&candidate); return 0; } @@ -1056,7 +1062,7 @@ const char *setup_git_directory_gently(int *nongit_ok) static struct strbuf cwd = STRBUF_INIT; struct strbuf dir = STRBUF_INIT, gitdir = STRBUF_INIT; const char *prefix; - struct repository_format repo_fmt; + struct repository_format repo_fmt = REPOSITORY_FORMAT_INIT; /* * We may have read an incomplete configuration before @@ -1146,6 +1152,7 @@ const char *setup_git_directory_gently(int *nongit_ok) strbuf_release(&dir); strbuf_release(&gitdir); + clear_repository_format(&repo_fmt); return prefix; } @@ -1203,9 +1210,10 @@ int git_config_perm(const char *var, const char *value) void check_repository_format(void) { - struct repository_format repo_fmt; + struct repository_format repo_fmt = REPOSITORY_FORMAT_INIT; check_repository_format_gently(get_git_dir(), &repo_fmt, NULL); startup_info->have_repository = 1; + clear_repository_format(&repo_fmt); } /* diff --git a/worktree.c b/worktree.c index d6a0ee7f73..b45bfeb9d3 100644 --- a/worktree.c +++ b/worktree.c @@ -444,7 +444,7 @@ int submodule_uses_worktrees(const char *path) DIR *dir; struct dirent *d; int ret = 0; - struct repository_format format; + struct repository_format format = REPOSITORY_FORMAT_INIT; submodule_gitdir = git_pathdup_submodule(path, "%s", ""); if (!submodule_gitdir) @@ -462,8 +462,10 @@ int submodule_uses_worktrees(const char *path) read_repository_format(&format, sb.buf); if (format.version != 0) { strbuf_release(&sb); + clear_repository_format(&format); return 1; } + clear_repository_format(&format); /* Replace config by worktrees. */ strbuf_setlen(&sb, sb.len - strlen("config"));