log: fix a memory leak in "git show <revision>..."

Fix a memory leak in code added in 5d7eeee2ac6 (git-show: grok blobs,
trees and tags, too, 2006-12-14). As we iterate over a "<revision>..."
command-line and encounter ad OBJ_COMMIT we want to use our "struct
rev_info", but with a "pending" array of one element: the one commit
we're showing in the loop.

To do this 5d7eeee2ac6 saved away a pointer to rev.pending.objects and
rev.pending.nr for its iteration. We'd then clobber those (and alloc)
when we needed to show an OBJ_COMMIT.

We'd therefore leak the "rev.pending" we started out with, and only
free the new "rev.pending" in the "OBJ_COMMIT" case arm as
prepare_revision_walk() would draw it down.

Let's fix this memory leak. Now when we encounter an OBJ_COMMIT we
save away the "rev.pending" before clearing it. We then add a single
commit to it, which our indirect invocation of prepare_revision_walk()
will remove. After that we restore the "rev.pending".

Our "rev.pending" will then get free'd by the release_revisions()
added in f6bfea0ad01 (revisions API users: use release_revisions() in
builtin/log.c, 2022-04-13)

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

9 files changed, 8 insertions, 2 deletions

diff --git a/t/t0203-gettext-setlocale-sanity.sh b/t/t0203-gettext-setlocale-sanity.sh
index 0ce1f22eff..86cff324ff 100755
--- a/t/t0203-gettext-setlocale-sanity.sh
+++ b/t/t0203-gettext-setlocale-sanity.sh
@@ -5,6 +5,7 @@
 
 test_description="The Git C functions aren't broken by setlocale(3)"
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./lib-gettext.sh
 
 test_expect_success 'git show a ISO-8859-1 commit under C locale' '
diff --git a/t/t1020-subdirectory.sh b/t/t1020-subdirectory.sh
index 9fdbb2af80..45eef9457f 100755
--- a/t/t1020-subdirectory.sh
+++ b/t/t1020-subdirectory.sh
@@ -6,6 +6,7 @@
 test_description='Try various core-level commands in subdirectory.
 '
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-read-tree.sh
 
diff --git a/t/t3307-notes-man.sh b/t/t3307-notes-man.sh
index 1aa366a410..ae316502c4 100755
--- a/t/t3307-notes-man.sh
+++ b/t/t3307-notes-man.sh
@@ -4,6 +4,7 @@ test_description='Examples from the git-notes man page
 
 Make sure the manual is not full of lies.'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '
diff --git a/t/t3920-crlf-messages.sh b/t/t3920-crlf-messages.sh
index 0276edbe3d..4c661d4d54 100755
--- a/t/t3920-crlf-messages.sh
+++ b/t/t3920-crlf-messages.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='Test ref-filter and pretty APIs for commit and tag messages using CRLF'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 LIB_CRLF_BRANCHES=""
diff --git a/t/t4069-remerge-diff.sh b/t/t4069-remerge-diff.sh
index 35f94957fc..9e7cac68b1 100755
--- a/t/t4069-remerge-diff.sh
+++ b/t/t4069-remerge-diff.sh
@@ -2,6 +2,7 @@
 
 test_description='remerge-diff handling'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # This test is ort-specific
diff --git a/t/t7007-show.sh b/t/t7007-show.sh
index d6cc69e0f2..f908a4d1ab 100755
--- a/t/t7007-show.sh
+++ b/t/t7007-show.sh
@@ -2,6 +2,7 @@
 
 test_description='git show'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success setup '
diff --git a/t/t7503-pre-commit-and-pre-merge-commit-hooks.sh b/t/t7503-pre-commit-and-pre-merge-commit-hooks.sh
index ad1eb64ba0..aa004b70a8 100755
--- a/t/t7503-pre-commit-and-pre-merge-commit-hooks.sh
+++ b/t/t7503-pre-commit-and-pre-merge-commit-hooks.sh
@@ -5,6 +5,7 @@ test_description='pre-commit and pre-merge-commit hooks'
 GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'root commit' '
diff --git a/t/t9122-git-svn-author.sh b/t/t9122-git-svn-author.sh
index 527ba3d293..0fc289ae0f 100755
--- a/t/t9122-git-svn-author.sh
+++ b/t/t9122-git-svn-author.sh
@@ -2,7 +2,6 @@
 
 test_description='git svn authorship'
 
-TEST_FAILS_SANITIZE_LEAK=true
 . ./lib-git-svn.sh
 
 test_expect_success 'setup svn repository' '
diff --git a/t/t9162-git-svn-dcommit-interactive.sh b/t/t9162-git-svn-dcommit-interactive.sh
index e2aa8ed88a..b3ce033a0d 100755
--- a/t/t9162-git-svn-dcommit-interactive.sh
+++ b/t/t9162-git-svn-dcommit-interactive.sh
@@ -4,7 +4,6 @@
 
 test_description='git svn dcommit --interactive series'
 
-TEST_FAILS_SANITIZE_LEAK=true
 . ./lib-git-svn.sh
 
 test_expect_success 'initialize repo' '