Extend the the release_revisions() function so that it frees the
"prune_data" in the "struct ref_info".
The log family of functions now calls the clear_mailmap() function
added in fa8afd18e5a (revisions API: provide and use a
release_revisions(), 2021-09-19), allowing us to whitelist some tests
with "TEST_PASSES_SANITIZE_LEAK=true".
Unfortunately having a pointer to a mailmap in "struct rev_info"
instead of an embedded member that we "own" get a bit messy, as can be
seen in the change to builtin/commit.c.
When we free() this data we won't be able to tell apart a pointer to a
"mailmap" on the heap from one on the stack. As seen in
ea57bc0d41b (log: add --use-mailmap option, 2013-01-05) the "log"
family allocates it on the heap, but in the find_author_by_nickname()
code added in ea16794e430 (commit: search author pattern against
mailmap, 2013-08-23) we allocated it on the stack instead.
Ideally we'd simply change that member to a "struct string_list
mailmap" and never free() the "mailmap" itself, but that would be a
much larger change to the revisions API.
We have code that needs to hand an existing "mailmap" to a "struct
rev_info", while we could change all of that, let's not go there
now.
The complexity isn't in the ownership of the "mailmap" per-se, but
that various things assume a "rev_info.mailmap == NULL" means "doesn't
want mailmap", if we changed that to an init'd "struct string_list
we'd need to carefully refactor things to change those assumptions.
Let's instead always free() it, and simply declare that if you add
such a "mailmap" it must be allocated on the heap. Any modern libc
will correctly panic if we free() a stack variable, so this should be
safe going forward.
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@xxxxxxxxx>
---
builtin/commit.c | 6 +++---
revision.c | 9 +++++++++
t/t0056-git-C.sh | 1 +
t/t4055-diff-context.sh | 1 +
t/t4066-diff-emit-delay.sh | 1 +
t/t7008-filter-branch-null-sha1.sh | 2 ++
6 files changed, 17 insertions(+), 3 deletions(-)
diff --git a/builtin/commit.c b/builtin/commit.c
index 74388a6b9a1..9a6f38db165 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -1097,7 +1097,7 @@ static const char *find_author_by_nickname(const char *name)
struct rev_info revs;
struct commit *commit;
struct strbuf buf = STRBUF_INIT;
- struct string_list mailmap = STRING_LIST_INIT_NODUP;
+ struct string_list *mailmap = xmalloc(sizeof(struct string_list));
const char *av[20];
int ac = 0;
@@ -1108,7 +1108,8 @@ static const char *find_author_by_nickname(const char *name)
av[++ac] = buf.buf;
av[++ac] = NULL;
setup_revisions(ac, av, &revs, NULL);
- revs.mailmap = &mailmap;
+ string_list_init_nodup(mailmap);
+ revs.mailmap = mailmap;
read_mailmap(revs.mailmap);
if (prepare_revision_walk(&revs))
@@ -1119,7 +1120,6 @@ static const char *find_author_by_nickname(const char *name)
ctx.date_mode.type = DATE_NORMAL;
strbuf_release(&buf);
format_commit_message(commit, "%aN <%aE>", &buf, &ctx);
- clear_mailmap(&mailmap);
release_revisions(&revs);
return strbuf_detach(&buf, NULL);
}
diff --git a/revision.c b/revision.c
index 475901d77e3..2050a691683 100644
--- a/revision.c
+++ b/revision.c
@@ -2926,12 +2926,21 @@ static void release_revisions_commit_list(struct rev_info *revs)
revs->commits = NULL;
}
+static void release_revisions_mailmap(struct string_list *mailmap)
+{
+ if (!mailmap)
+ return;
+ clear_mailmap(mailmap);
+ free(mailmap);
+}
+
void release_revisions(struct rev_info *revs)
{
if (!revs)
return;
release_revisions_commit_list(revs);
object_array_clear(&revs->pending);
+ release_revisions_mailmap(revs->mailmap);
}
static void add_child(struct rev_info *revs, struct commit *parent, struct commit *child)
diff --git a/t/t0056-git-C.sh b/t/t0056-git-C.sh
index 2630e756dab..752aa8c9454 100755
--- a/t/t0056-git-C.sh
+++ b/t/t0056-git-C.sh
@@ -2,6 +2,7 @@
test_description='"-C <path>" option and its effects on other path-related options'
+TEST_PASSES_SANITIZE_LEAK=true
. ./test-lib.sh
test_expect_success '"git -C <path>" runs git from the directory <path>' '
diff --git a/t/t4055-diff-context.sh b/t/t4055-diff-context.sh
index 741e0803c1a..73048d0a526 100755
--- a/t/t4055-diff-context.sh
+++ b/t/t4055-diff-context.sh
@@ -5,6 +5,7 @@
test_description='diff.context configuration'
+TEST_PASSES_SANITIZE_LEAK=true
. ./test-lib.sh
test_expect_success 'setup' '
diff --git a/t/t4066-diff-emit-delay.sh b/t/t4066-diff-emit-delay.sh
index a1de63b77f8..0ecb3915412 100755
--- a/t/t4066-diff-emit-delay.sh
+++ b/t/t4066-diff-emit-delay.sh
@@ -4,6 +4,7 @@ test_description='test combined/stat/moved interaction'
GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+TEST_PASSES_SANITIZE_LEAK=true
. ./test-lib.sh
# This test covers a weird 3-way interaction between "--cc -p", which will run
diff --git a/t/t7008-filter-branch-null-sha1.sh b/t/t7008-filter-branch-null-sha1.sh
index 9ba9f24ad2f..0ce8fd2c895 100755
--- a/t/t7008-filter-branch-null-sha1.sh
+++ b/t/t7008-filter-branch-null-sha1.sh
@@ -1,6 +1,8 @@
#!/bin/sh
test_description='filter-branch removal of trees with null sha1'
+
+TEST_PASSES_SANITIZE_LEAK=true
. ./test-lib.sh
test_expect_success 'setup: base commits' '
--
2.35.1.1295.g6b025d3e231
