We build up a string list of listen addresses from the command-line
arguments, but never free it. This causes t5811 to complain of a leak
(though curiously it seems to do so only when compiled with gcc, not
with clang).
To handle this correctly, we have to do a little refactoring:
- there are two exit points from the main function, depending on
whether we are entering the main loop or serving a single client
(since rather than a traditional fork model, we re-exec ourselves
with the extra "--serve" argument to accommodate Windows).
We don't need --listen at all in the --serve case, of course, but it
is passed along by the parent daemon, which simply copies all of the
command-line options it got.
- we just "return serve()" to run the main loop, giving us no chance
to do any cleanup
So let's use a "ret" variable to store the return code, and give
ourselves a single exit point at the end. That gives us one place to do
cleanup.
Note that this code also uses the "use a no-dup string-list, but
allocate strings we add to it" trick, meaning string_list_clear() will
not realize it should free them. We can fix this by switching to a "dup"
string-list, but using the "append_nodup" function to add to it (this is
preferable to tweaking the strdup_strings flag before clearing, as it
puts all the subtle memory-ownership code together).
Signed-off-by: Jeff King <peff@xxxxxxxx>
---
Diff is a little messy due to indentation. Viewing with "-w" makes it
more clear, or just viewing the post-image.
daemon.c | 37 ++++++++++++++++++++----------------
t/t5811-proto-disable-git.sh | 2 ++
2 files changed, 23 insertions(+), 16 deletions(-)
diff --git a/daemon.c b/daemon.c
index f5e597114b..17d331b2f3 100644
--- a/daemon.c
+++ b/daemon.c
@@ -1243,19 +1243,20 @@ static int serve(struct string_list *listen_addr, int listen_port,
int cmd_main(int argc, const char **argv)
{
int listen_port = 0;
- struct string_list listen_addr = STRING_LIST_INIT_NODUP;
+ struct string_list listen_addr = STRING_LIST_INIT_DUP;
int serve_mode = 0, inetd_mode = 0;
const char *pid_file = NULL, *user_name = NULL, *group_name = NULL;
int detach = 0;
struct credentials *cred = NULL;
int i;
+ int ret;
for (i = 1; i < argc; i++) {
const char *arg = argv[i];
const char *v;
if (skip_prefix(arg, "--listen=", &v)) {
- string_list_append(&listen_addr, xstrdup_tolower(v));
+ string_list_append_nodup(&listen_addr, xstrdup_tolower(v));
continue;
}
if (skip_prefix(arg, "--port=", &v)) {
@@ -1437,22 +1438,26 @@ int cmd_main(int argc, const char **argv)
die_errno("failed to redirect stderr to /dev/null");
}
- if (inetd_mode || serve_mode)
- return execute();
+ if (inetd_mode || serve_mode) {
+ ret = execute();
+ } else {
+ if (detach) {
+ if (daemonize())
+ die("--detach not supported on this platform");
+ }
- if (detach) {
- if (daemonize())
- die("--detach not supported on this platform");
- }
+ if (pid_file)
+ write_file(pid_file, "%"PRIuMAX, (uintmax_t) getpid());
- if (pid_file)
- write_file(pid_file, "%"PRIuMAX, (uintmax_t) getpid());
+ /* prepare argv for serving-processes */
+ strvec_push(&cld_argv, argv[0]); /* git-daemon */
+ strvec_push(&cld_argv, "--serve");
+ for (i = 1; i < argc; ++i)
+ strvec_push(&cld_argv, argv[i]);
- /* prepare argv for serving-processes */
- strvec_push(&cld_argv, argv[0]); /* git-daemon */
- strvec_push(&cld_argv, "--serve");
- for (i = 1; i < argc; ++i)
- strvec_push(&cld_argv, argv[i]);
+ ret = serve(&listen_addr, listen_port, cred);
+ }
- return serve(&listen_addr, listen_port, cred);
+ string_list_clear(&listen_addr, 0);
+ return ret;
}
diff --git a/t/t5811-proto-disable-git.sh b/t/t5811-proto-disable-git.sh
index 8ac6b2a1d0..ed773e7432 100755
--- a/t/t5811-proto-disable-git.sh
+++ b/t/t5811-proto-disable-git.sh
@@ -1,6 +1,8 @@
#!/bin/sh
test_description='test disabling of git-over-tcp in clone/fetch'
+
+TEST_PASSES_SANITIZE_LEAK=true
. ./test-lib.sh
. "$TEST_DIRECTORY/lib-proto-disable.sh"
. "$TEST_DIRECTORY/lib-git-daemon.sh"
--
2.42.0.836.g4b88bf80c5
