X-Git-Url: https://git.distorted.org.uk/~mdw/secnet/blobdiff_plain/7b1a9fb74228564b5ee07b48c042ee7b9a2260f1..b7164ab60bf28a93fc02bb65b784134fcbbc41c5:/util.c

diff --git a/util.c b/util.c
index 63fe76f..086c234 100644
--- 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;