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-rw-r--r--pack.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/pack.c b/pack.c
index a435e13..498c355 100644
--- a/pack.c
+++ b/pack.c
@@ -499,6 +499,9 @@ pack_pack(ary, fmt)
#define NEXTFROM (items-- > 0 ? RARRAY(ary)->ptr[idx++] : (rb_raise(rb_eArgError, toofew),0))
while (p < pend) {
+ if (RSTRING(fmt)->ptr + RSTRING(fmt)->len != pend) {
+ rb_raise(rb_eRuntimeError, "format string modified");
+ }
type = *p++; /* get data type */
#ifdef NATINT_PACK
natint = 0;