diff --git a/src/gsm/cbsp.c b/src/gsm/cbsp.c
index 2095003..a31517b 100644
--- a/src/gsm/cbsp.c
+++ b/src/gsm/cbsp.c
@@ -1441,6 +1441,10 @@
 
 	needed = len - msgb_l2len(msg);
 	if (needed > 0) {
+		if (needed > msgb_tailroom(msg)) {
+			rc = -ENOMEM;
+			goto discard_msg;
+		}
 		rc = recv(fd, msg->tail, needed, 0);
 		if (rc == 0)
 			goto discard_msg;