From: "Martin Ågren" <martin.agren@gmail.com>
To: git@vger.kernel.org
Subject: [PATCH] reduce_heads: fix memory leaks
Date: Wed, 1 Nov 2017 10:03:26 +0100 [thread overview]
Message-ID: <20171101090326.8091-1-martin.agren@gmail.com> (raw)
We currently have seven callers of `reduce_heads(foo)`. Six of them do
not use the original list `foo` again, and actually, all six of those
end up leaking it.
Introduce and use `reduce_heads_replace(&foo)` as a leak-free version of
`foo = reduce_heads(foo)` to fix several of these. Fix the remaining
leaks using `free_commit_list()`.
While we're here, document `reduce_heads()` and mark it as `extern`.
Signed-off-by: Martin Ågren <martin.agren@gmail.com>
---
builtin/commit.c | 2 +-
builtin/fmt-merge-msg.c | 2 +-
builtin/merge-base.c | 6 +++++-
builtin/merge.c | 1 +
builtin/pull.c | 4 +++-
commit.c | 7 +++++++
commit.h | 18 +++++++++++++++++-
7 files changed, 35 insertions(+), 5 deletions(-)
diff --git a/builtin/commit.c b/builtin/commit.c
index d75b3805e..11c474018 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -1728,7 +1728,7 @@ int cmd_commit(int argc, const char **argv, const char *prefix)
allow_fast_forward = 0;
}
if (allow_fast_forward)
- parents = reduce_heads(parents);
+ reduce_heads_replace(&parents);
} else {
if (!reflog_msg)
reflog_msg = (whence == FROM_CHERRY_PICK)
diff --git a/builtin/fmt-merge-msg.c b/builtin/fmt-merge-msg.c
index e99b5ddbf..27a2361e9 100644
--- a/builtin/fmt-merge-msg.c
+++ b/builtin/fmt-merge-msg.c
@@ -571,7 +571,7 @@ static void find_merge_parents(struct merge_parents *result,
head_commit = lookup_commit(head);
if (head_commit)
commit_list_insert(head_commit, &parents);
- parents = reduce_heads(parents);
+ reduce_heads_replace(&parents);
while (parents) {
struct commit *cmit = pop_commit(&parents);
diff --git a/builtin/merge-base.c b/builtin/merge-base.c
index 6dbd167d3..b1b7590c4 100644
--- a/builtin/merge-base.c
+++ b/builtin/merge-base.c
@@ -59,6 +59,8 @@ static int handle_independent(int count, const char **args)
commit_list_insert(get_commit_reference(args[i]), &revs);
result = reduce_heads(revs);
+ free_commit_list(revs);
+
if (!result)
return 1;
@@ -78,7 +80,9 @@ static int handle_octopus(int count, const char **args, int show_all)
for (i = count - 1; i >= 0; i--)
commit_list_insert(get_commit_reference(args[i]), &revs);
- result = reduce_heads(get_octopus_merge_bases(revs));
+ result = get_octopus_merge_bases(revs);
+ free_commit_list(revs);
+ reduce_heads_replace(&result);
if (!result)
return 1;
diff --git a/builtin/merge.c b/builtin/merge.c
index ab5ffe85e..fbbf2a9e5 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -999,6 +999,7 @@ static struct commit_list *reduce_parents(struct commit *head_commit,
/* Find what parents to record by checking independent ones. */
parents = reduce_heads(remoteheads);
+ free_commit_list(remoteheads);
remoteheads = NULL;
remotes = &remoteheads;
diff --git a/builtin/pull.c b/builtin/pull.c
index 6f772e8a2..5eeaa8c68 100644
--- a/builtin/pull.c
+++ b/builtin/pull.c
@@ -745,8 +745,10 @@ static int get_octopus_merge_base(struct object_id *merge_base,
if (!is_null_oid(fork_point))
commit_list_insert(lookup_commit_reference(fork_point), &revs);
- result = reduce_heads(get_octopus_merge_bases(revs));
+ result = get_octopus_merge_bases(revs);
free_commit_list(revs);
+ reduce_heads_replace(&result);
+
if (!result)
return 1;
diff --git a/commit.c b/commit.c
index 1e0e63379..cab8d4455 100644
--- a/commit.c
+++ b/commit.c
@@ -1090,6 +1090,13 @@ struct commit_list *reduce_heads(struct commit_list *heads)
return result;
}
+void reduce_heads_replace(struct commit_list **heads)
+{
+ struct commit_list *result = reduce_heads(*heads);
+ free_commit_list(*heads);
+ *heads = result;
+}
+
static const char gpg_sig_header[] = "gpgsig";
static const int gpg_sig_header_len = sizeof(gpg_sig_header) - 1;
diff --git a/commit.h b/commit.h
index 6d769590f..99a3fea68 100644
--- a/commit.h
+++ b/commit.h
@@ -313,7 +313,23 @@ extern int interactive_add(int argc, const char **argv, const char *prefix, int
extern int run_add_interactive(const char *revision, const char *patch_mode,
const struct pathspec *pathspec);
-struct commit_list *reduce_heads(struct commit_list *heads);
+/*
+ * Takes a list of commits and returns a new list where those
+ * have been removed that can be reached from other commits in
+ * the list. It is useful for, e.g., reducing the commits
+ * randomly thrown at the git-merge command and removing
+ * redundant commits that the user shouldn't have given to it.
+ *
+ * This function destroys the STALE bit of the commit objects'
+ * flags.
+ */
+extern struct commit_list *reduce_heads(struct commit_list *heads);
+
+/*
+ * Like `reduce_heads()`, except it replaces the list. Use this
+ * instead of `foo = reduce_heads(foo);` to avoid memory leaks.
+ */
+extern void reduce_heads_replace(struct commit_list **heads);
struct commit_extra_header {
struct commit_extra_header *next;
--
2.15.0.415.gac1375d7e
next reply other threads:[~2017-11-01 9:03 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-01 9:03 Martin Ågren [this message]
2017-11-02 3:11 ` [PATCH] reduce_heads: fix memory leaks Junio C Hamano
2017-11-02 10:45 ` Martin Ågren
2017-11-05 20:26 ` [PATCH v2 0/2] " Martin Ågren
2017-11-05 20:26 ` [PATCH v2 1/2] builtin/merge-base: UNLEAK commit lists Martin Ågren
2017-11-06 1:03 ` Junio C Hamano
2017-11-06 11:05 ` Jeff King
2017-11-07 20:39 ` [PATCH v3 1/2] builtin/merge-base: free " Martin Ågren
2017-11-08 2:40 ` Junio C Hamano
2017-11-07 20:39 ` [PATCH v3 2/2] reduce_heads: fix memory leaks Martin Ågren
2017-11-05 20:26 ` [PATCH v2 " Martin Ågren
2017-11-06 1:12 ` [PATCH v2 0/2] " Junio C Hamano
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: http://vger.kernel.org/majordomo-info.html
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20171101090326.8091-1-martin.agren@gmail.com \
--to=martin.agren@gmail.com \
--cc=git@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://80x24.org/mirrors/git.git
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).