site: Break out separate function for decrypting msg0

[secnet] / util.c

diff --git a/util.c b/util.c
index 63fe76f..086c234 100644 (file)
--- a/util.c
+++ b/util.c
@@ -269,6 +269,7 @@ void *buf_unappend(struct buffer_if *buf, int32_t amount) {
 
 void *buf_unprepend(struct buffer_if *buf, int32_t amount) {
     void *p;
+    if (buf->size < amount) return 0;
     p=buf->start;
     buf->start+=amount;
     buf->size-=amount;