[PATCH 1/2] checkout: handling branch_info memory leak

["ZheNing Hu via GitGitGadget" <gitgitgadget@gmail.com>]

From: ZheNing Hu <adlternative@gmail.com>

On the checkout code path, we dynamically allocate
memory for `refname` and `path` in `struct branch_info`,
but did not free their memory at the end. So introduce
branch_info_clear() which can free branch_info memory.

Signed-off-by: ZheNing Hu <adlternative@gmail.com>
---
 builtin/checkout.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/builtin/checkout.c b/builtin/checkout.c
index cbf73b8c9f6..3eeac3147f2 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -103,6 +103,15 @@ struct branch_info {
 	char *checkout;
 };
 
+static void branch_info_clear(struct branch_info *branch_info) {
+	if (branch_info->path) {
+		free((char *)branch_info->path);
+		branch_info->path = NULL;
+	}
+	if (branch_info->refname)
+		FREE_AND_NULL(branch_info->refname);
+}
+
 static int post_checkout_hook(struct commit *old_commit, struct commit *new_commit,
 			      int changed)
 {
@@ -1578,6 +1587,7 @@ static int checkout_main(int argc, const char **argv, const char *prefix,
 {
 	struct branch_info new_branch_info;
 	int parseopt_flags = 0;
+	int ret = 0;
 
 	memset(&new_branch_info, 0, sizeof(new_branch_info));
 	opts->overwrite_ignore = 1;
@@ -1768,9 +1778,11 @@ static int checkout_main(int argc, const char **argv, const char *prefix,
 
 	UNLEAK(opts);
 	if (opts->patch_mode || opts->pathspec.nr)
-		return checkout_paths(opts, &new_branch_info);
+		ret = checkout_paths(opts, &new_branch_info);
 	else
-		return checkout_branch(opts, &new_branch_info);
+		ret = checkout_branch(opts, &new_branch_info);
+	branch_info_clear(&new_branch_info);
+	return ret;
 }
 
 int cmd_checkout(int argc, const char **argv, const char *prefix)
-- 
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