relay: add a missing buffer availability check

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/relay.c b/relay.c
index ba6b95a..83664e6 100644
--- a/relay.c
+++ b/relay.c
@@ -76,6 +76,9 @@ static void relay_process_headers(struct relay *r)
 		char *val;
 
 		buf = ustream_get_read_buf(s, &len);
+		if (!buf || !len)
+			break;
+
 		newline = strchr(buf, '\n');
 		if (!newline)
 			break;