[PATCH 12/13] fsmonitor: plug token-data leak on early daemon-startup failures

["Johannes Schindelin via GitGitGadget" <gitgitgadget@gmail.com>]

From: Johannes Schindelin <johannes.schindelin@gmx.de>

`fsmonitor_run_daemon()` allocates `state.current_token_data`
before any subordinate setup step that may fail (alias resolution,
listener/health constructors, asynchronous IPC server init). On
the successful path the listener thread takes ownership and clears
the field during its teardown, so the `done:` cleanup block sees a
NULL pointer. On every early-error path, however, control jumps
straight to `done:` with the freshly allocated token data still
referenced, and it is never freed, as Coverity flagged.

Free it at the top of `done:` and clear the pointer. The success
path is a no-op (the pointer is already NULL there); the error
paths now drop the otherwise-leaked allocation.
`fsmonitor_free_token_data()` is NULL-safe and asserts
`client_ref_count == 0`, which holds trivially here because the
IPC server has not yet begun accepting clients when these failures
occur.

Assisted-by: Opus 4.7
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
---
 builtin/fsmonitor--daemon.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/builtin/fsmonitor--daemon.c b/builtin/fsmonitor--daemon.c
index f920cf3a82..4161dd8282 100644
--- a/builtin/fsmonitor--daemon.c
+++ b/builtin/fsmonitor--daemon.c
@@ -1418,6 +1418,8 @@ static int fsmonitor_run_daemon(void)
 	err = fsmonitor_run_daemon_1(&state);
 
 done:
+	fsmonitor_free_token_data(state.current_token_data);
+	state.current_token_data = NULL;
 	pthread_cond_destroy(&state.cookies_cond);
 	pthread_mutex_destroy(&state.main_lock);
 	{
-- 
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