[PATCH 3/3] daemon: guard NULL REMOTE_PORT in execute() logging

["Sebastien Tardif via GitGitGadget" <gitgitgadget@gmail.com>]

From: Sebastien Tardif <sebtardif@ncf.ca>

The REMOTE_PORT environment variable is used in a format string
without a NULL check, while REMOTE_ADDR is checked. If REMOTE_PORT
is unset, NULL is passed to printf's %s, which is undefined behavior.

Add a fallback string for the NULL case.

Signed-off-by: Sebastien Tardif <sebtardif@ncf.ca>
---
 daemon.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/daemon.c b/daemon.c
index 103c08d868..78cca8673f 100644
--- a/daemon.c
+++ b/daemon.c
@@ -753,7 +753,7 @@ static int execute(void)
 	struct strvec env = STRVEC_INIT;
 
 	if (addr)
-		loginfo("Connection from %s:%s", addr, port);
+		loginfo("Connection from %s:%s", addr, port ? port : "?");
 
 	set_keep_alive(0);
 	alarm(init_timeout ? init_timeout : timeout);
-- 
gitgitgadget