[PATCH 09/34] convert: release strbuf on error return in filter_buffer_or_fd()

[Rene Scharfe <l.s.r@xxxxxx>]

Signed-off-by: Rene Scharfe <l.s.r@xxxxxx>
---
 convert.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/convert.c b/convert.c
index c5f0b21037..4a0ed8d3cb 100644
--- a/convert.c
+++ b/convert.c
@@ -393,63 +393,65 @@ struct filter_params {
 static int filter_buffer_or_fd(int in, int out, void *data)
 {
 	/*
 	 * Spawn cmd and feed the buffer contents through its stdin.
 	 */
 	struct child_process child_process = CHILD_PROCESS_INIT;
 	struct filter_params *params = (struct filter_params *)data;
 	int write_err, status;
 	const char *argv[] = { NULL, NULL };
 
 	/* apply % substitution to cmd */
 	struct strbuf cmd = STRBUF_INIT;
 	struct strbuf path = STRBUF_INIT;
 	struct strbuf_expand_dict_entry dict[] = {
 		{ "f", NULL, },
 		{ NULL, NULL, },
 	};
 
 	/* quote the path to preserve spaces, etc. */
 	sq_quote_buf(&path, params->path);
 	dict[0].value = path.buf;
 
 	/* expand all %f with the quoted path */
 	strbuf_expand(&cmd, params->cmd, strbuf_expand_dict_cb, &dict);
 	strbuf_release(&path);
 
 	argv[0] = cmd.buf;
 
 	child_process.argv = argv;
 	child_process.use_shell = 1;
 	child_process.in = -1;
 	child_process.out = out;
 
-	if (start_command(&child_process))
+	if (start_command(&child_process)) {
+		strbuf_release(&cmd);
 		return error("cannot fork to run external filter '%s'", params->cmd);
+	}
 
 	sigchain_push(SIGPIPE, SIG_IGN);
 
 	if (params->src) {
 		write_err = (write_in_full(child_process.in,
 					   params->src, params->size) < 0);
 		if (errno == EPIPE)
 			write_err = 0;
 	} else {
 		write_err = copy_fd(params->fd, child_process.in);
 		if (write_err == COPY_WRITE_ERROR && errno == EPIPE)
 			write_err = 0;
 	}
 
 	if (close(child_process.in))
 		write_err = 1;
 	if (write_err)
 		error("cannot feed the input to external filter '%s'", params->cmd);
 
 	sigchain_pop(SIGPIPE);
 
 	status = finish_command(&child_process);
 	if (status)
 		error("external filter '%s' failed %d", params->cmd, status);
 
 	strbuf_release(&cmd);
 	return (write_err || status);
 }
-- 
2.14.1