X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=util.c;h=086c23440ffd1fc592495b5235277a9e104f063d;hb=20138876b39edc6b9bbcc79789c5aa1a684d3312;hp=63fe76f4451a80e2a6c266fffb8c1aabd878d20f;hpb=7b1a9fb74228564b5ee07b48c042ee7b9a2260f1;p=secnet.git

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;