receive-pack: release the linked "struct command *" list

Fix a memory leak that's been with us since this code was introduced
in [1]. Later in [2] we started using FLEX_ALLOC_MEM() to allocate the
"struct command *".

1. 575f497456 (Add first cut at "git-receive-pack", 2005-06-29)
2. eb1af2df0b (git-receive-pack: start parsing ref update commands,
   2005-06-29)

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

builtin/receive-pack.c

@@ -2032,6 +2032,16 @@ static struct command **queue_command(struct command **tail,
 	return &cmd->next;
 }
 
+static void free_commands(struct command *commands)
+{
+	while (commands) {
+		struct command *next = commands->next;
+
+		free(commands);
+		commands = next;
+	}
+}
+
 static void queue_commands_from_cert(struct command **tail,
 				     struct strbuf *push_cert)
 {
@@ -2569,6 +2579,7 @@ int cmd_receive_pack(int argc, const char **argv, const char *prefix)
 		run_receive_hook(commands, "post-receive", 1,
 				 &push_options);
 		run_update_post_hook(commands);
+		free_commands(commands);
 		string_list_clear(&push_options, 0);
 		if (auto_gc) {
 			struct child_process proc = CHILD_PROCESS_INIT;

t/t5405-send-pack-rewind.sh

@@ -5,6 +5,7 @@ test_description='forced push to replace commit we do not have'
 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 setup '

t/t5406-remote-rejects.sh

@@ -2,6 +2,7 @@
 
 test_description='remote push rejects are reported by client'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup' '

t/t5507-remote-environment.sh

@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='check environment showed to remote side of transports'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'set up "remote" push situation' '

t/t5522-pull-symlink.sh

@@ -2,6 +2,7 @@
 
 test_description='pulling from symlinked subdir'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # The scenario we are building:

t/t5527-fetch-odd-refs.sh

@@ -4,6 +4,7 @@ test_description='test fetching of oddly-named refs'
 GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # afterwards we will have:

t/t5560-http-backend-noserver.sh

@@ -4,6 +4,7 @@ test_description='test git-http-backend-noserver'
 GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 HTTPD_DOCUMENT_ROOT_PATH="$TRASH_DIRECTORY"

t/t5561-http-backend.sh

@@ -4,6 +4,7 @@ test_description='test git-http-backend'
 GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-httpd.sh
 

t/t5562-http-backend-content-length.sh

@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='test git-http-backend respects CONTENT_LENGTH'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_lazy_prereq GZIP 'gzip --version'

t/t5705-session-id-in-capabilities.sh

@@ -2,6 +2,7 @@
 
 test_description='session ID in capabilities'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 REPO="$(pwd)/repo"