From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on dcvr.yhbt.net X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=AWL,BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_PASS, SPF_PASS shortcircuit=no autolearn=ham autolearn_force=no version=3.4.2 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by dcvr.yhbt.net (Postfix) with ESMTP id C17ED1F4B4 for ; Mon, 5 Oct 2020 07:19:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725893AbgJEHTH (ORCPT ); Mon, 5 Oct 2020 03:19:07 -0400 Received: from cloud.peff.net ([104.130.231.41]:49216 "EHLO cloud.peff.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725873AbgJEHTH (ORCPT ); Mon, 5 Oct 2020 03:19:07 -0400 Received: (qmail 30289 invoked by uid 109); 5 Oct 2020 07:19:06 -0000 Received: from Unknown (HELO peff.net) (10.0.1.2) by cloud.peff.net (qpsmtpd/0.94) with ESMTP; Mon, 05 Oct 2020 07:19:06 +0000 Authentication-Results: cloud.peff.net; auth=none Received: (qmail 16411 invoked by uid 111); 5 Oct 2020 07:19:06 -0000 Received: from coredump.intra.peff.net (HELO sigill.intra.peff.net) (10.0.0.2) by peff.net (qpsmtpd/0.94) with (TLS_AES_256_GCM_SHA384 encrypted) ESMTPS; Mon, 05 Oct 2020 03:19:06 -0400 Authentication-Results: peff.net; auth=none Date: Mon, 5 Oct 2020 03:19:05 -0400 From: Jeff King To: git@vger.kernel.org Cc: Jonathan Nieder Subject: [PATCH 1/7] fsck_tree(): fix shadowed variable Message-ID: <20201005071905.GA2291074@coredump.intra.peff.net> References: <20201005071751.GA2290770@coredump.intra.peff.net> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20201005071751.GA2290770@coredump.intra.peff.net> Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org Commit b2f2039c2b (fsck: accept an oid instead of a "struct tree" for fsck_tree(), 2019-10-18) introduced a new "oid" parameter to fsck_tree(), and we pass it to the report() function when we find problems. However, that is shadowed within the tree-walking loop by the existing "oid" variable which we use to store the oid of each tree entry. As a result, we may report the wrong oid for some problems we detect within the loop (the entry oid, instead of the tree oid). Our tests didn't catch this because they checked only that we found the expected fsck problem, not that it was attached to the correct object. Let's rename both variables in the function to avoid confusion. This makes the diff a little noisy (e.g., all of the report() calls outside the loop wee already correct but need touched), but makes sure we catch all cases and will avoid similar confusion in the future. Signed-off-by: Jeff King --- fsck.c | 40 +++++++++++++++++++------------------- t/t7415-submodule-names.sh | 5 +++-- 2 files changed, 23 insertions(+), 22 deletions(-) diff --git a/fsck.c b/fsck.c index f82e2fe9e3..46a108839f 100644 --- a/fsck.c +++ b/fsck.c @@ -633,7 +633,7 @@ static int verify_ordered(unsigned mode1, const char *name1, return c1 < c2 ? 0 : TREE_UNORDERED; } -static int fsck_tree(const struct object_id *oid, +static int fsck_tree(const struct object_id *tree_oid, const char *buffer, unsigned long size, struct fsck_options *options) { @@ -654,7 +654,7 @@ static int fsck_tree(const struct object_id *oid, struct name_stack df_dup_candidates = { NULL }; if (init_tree_desc_gently(&desc, buffer, size)) { - retval += report(options, oid, OBJ_TREE, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree"); + retval += report(options, tree_oid, OBJ_TREE, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree"); return retval; } @@ -664,11 +664,11 @@ static int fsck_tree(const struct object_id *oid, while (desc.size) { unsigned short mode; const char *name, *backslash; - const struct object_id *oid; + const struct object_id *entry_oid; - oid = tree_entry_extract(&desc, &name, &mode); + entry_oid = tree_entry_extract(&desc, &name, &mode); - has_null_sha1 |= is_null_oid(oid); + has_null_sha1 |= is_null_oid(entry_oid); has_full_path |= !!strchr(name, '/'); has_empty_name |= !*name; has_dot |= !strcmp(name, "."); @@ -678,10 +678,10 @@ static int fsck_tree(const struct object_id *oid, if (is_hfs_dotgitmodules(name) || is_ntfs_dotgitmodules(name)) { if (!S_ISLNK(mode)) - oidset_insert(&gitmodules_found, oid); + oidset_insert(&gitmodules_found, entry_oid); else retval += report(options, - oid, OBJ_TREE, + tree_oid, OBJ_TREE, FSCK_MSG_GITMODULES_SYMLINK, ".gitmodules is a symbolic link"); } @@ -692,9 +692,9 @@ static int fsck_tree(const struct object_id *oid, has_dotgit |= is_ntfs_dotgit(backslash); if (is_ntfs_dotgitmodules(backslash)) { if (!S_ISLNK(mode)) - oidset_insert(&gitmodules_found, oid); + oidset_insert(&gitmodules_found, entry_oid); else - retval += report(options, oid, OBJ_TREE, + retval += report(options, tree_oid, OBJ_TREE, FSCK_MSG_GITMODULES_SYMLINK, ".gitmodules is a symbolic link"); } @@ -703,7 +703,7 @@ static int fsck_tree(const struct object_id *oid, } if (update_tree_entry_gently(&desc)) { - retval += report(options, oid, OBJ_TREE, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree"); + retval += report(options, tree_oid, OBJ_TREE, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree"); break; } @@ -751,25 +751,25 @@ static int fsck_tree(const struct object_id *oid, name_stack_clear(&df_dup_candidates); if (has_null_sha1) - retval += report(options, oid, OBJ_TREE, FSCK_MSG_NULL_SHA1, "contains entries pointing to null sha1"); + retval += report(options, tree_oid, OBJ_TREE, FSCK_MSG_NULL_SHA1, "contains entries pointing to null sha1"); if (has_full_path) - retval += report(options, oid, OBJ_TREE, FSCK_MSG_FULL_PATHNAME, "contains full pathnames"); + retval += report(options, tree_oid, OBJ_TREE, FSCK_MSG_FULL_PATHNAME, "contains full pathnames"); if (has_empty_name) - retval += report(options, oid, OBJ_TREE, FSCK_MSG_EMPTY_NAME, "contains empty pathname"); + retval += report(options, tree_oid, OBJ_TREE, FSCK_MSG_EMPTY_NAME, "contains empty pathname"); if (has_dot) - retval += report(options, oid, OBJ_TREE, FSCK_MSG_HAS_DOT, "contains '.'"); + retval += report(options, tree_oid, OBJ_TREE, FSCK_MSG_HAS_DOT, "contains '.'"); if (has_dotdot) - retval += report(options, oid, OBJ_TREE, FSCK_MSG_HAS_DOTDOT, "contains '..'"); + retval += report(options, tree_oid, OBJ_TREE, FSCK_MSG_HAS_DOTDOT, "contains '..'"); if (has_dotgit) - retval += report(options, oid, OBJ_TREE, FSCK_MSG_HAS_DOTGIT, "contains '.git'"); + retval += report(options, tree_oid, OBJ_TREE, FSCK_MSG_HAS_DOTGIT, "contains '.git'"); if (has_zero_pad) - retval += report(options, oid, OBJ_TREE, FSCK_MSG_ZERO_PADDED_FILEMODE, "contains zero-padded file modes"); + retval += report(options, tree_oid, OBJ_TREE, FSCK_MSG_ZERO_PADDED_FILEMODE, "contains zero-padded file modes"); if (has_bad_modes) - retval += report(options, oid, OBJ_TREE, FSCK_MSG_BAD_FILEMODE, "contains bad file modes"); + retval += report(options, tree_oid, OBJ_TREE, FSCK_MSG_BAD_FILEMODE, "contains bad file modes"); if (has_dup_entries) - retval += report(options, oid, OBJ_TREE, FSCK_MSG_DUPLICATE_ENTRIES, "contains duplicate file entries"); + retval += report(options, tree_oid, OBJ_TREE, FSCK_MSG_DUPLICATE_ENTRIES, "contains duplicate file entries"); if (not_properly_sorted) - retval += report(options, oid, OBJ_TREE, FSCK_MSG_TREE_NOT_SORTED, "not properly sorted"); + retval += report(options, tree_oid, OBJ_TREE, FSCK_MSG_TREE_NOT_SORTED, "not properly sorted"); return retval; } diff --git a/t/t7415-submodule-names.sh b/t/t7415-submodule-names.sh index f70368bc2e..5c95247180 100755 --- a/t/t7415-submodule-names.sh +++ b/t/t7415-submodule-names.sh @@ -148,13 +148,14 @@ test_expect_success 'fsck detects symlinked .gitmodules file' ' { printf "100644 blob $content\t$tricky\n" && printf "120000 blob $target\t.gitmodules\n" - } | git mktree && + } >bad-tree && + tree=$(git mktree output && - test_i18ngrep gitmodulesSymlink output + test_i18ngrep "tree $tree: gitmodulesSymlink" output ) ' -- 2.28.0.1295.g4824feede7