Make indirect_find() more resilient to embedded nuls

diff --git a/indirect.xs b/indirect.xs
index 494093e97cee9a2b1597b4d5efa8a84eae5fc548..e1961194bf1585b083f947d0201ceaca4bfed003 100644 (file)
--- a/indirect.xs
+++ b/indirect.xs
@@ -496,21 +496,28 @@ STATIC STRLEN indirect_nextline(const char *s, STRLEN len) {
 
 STATIC int indirect_find(pTHX_ SV *name_sv, const char *line_bufptr, STRLEN *name_pos) {
 #define indirect_find(NSV, LBP, NP) indirect_find(aTHX_ (NSV), (LBP), (NP))
- STRLEN name_len, line_len;
- const char *name, *p, *t, *u;
+ STRLEN      name_len, line_len;
+ const char *name, *name_end;
+ const char *line, *line_end;
+ const char *p, *t, *u;
+
+ line     = SvPV_const(PL_linestr, line_len);
+ line_end = line + line_len;
 
  name = SvPV_const(name_sv, name_len);
  if (name_len >= 1 && *name == '$') {
   ++name;
   --name_len;
-  line_bufptr = strchr(line_bufptr, '$');
-  if (!line_bufptr)
+  while (line_bufptr < line_end && *line_bufptr != '$')
+   ++line_bufptr;
+  if (line_bufptr >= line_end)
    return 0;
  }
+ name_end = name + name_len;
 
  p = line_bufptr;
  while (1) {
-  p = strstr(p, name);
+  p = ninstr(p, line_end, name, name_end);
   if (!p)
    return 0;
   if (!isALNUM(p[name_len]))
@@ -521,7 +528,7 @@ STATIC int indirect_find(pTHX_ SV *name_sv, const char *line_bufptr, STRLEN *nam
    ++p;
  }
 
- t = SvPV_const(PL_linestr, line_len);
+ t = line;
  u = t;
  while (t <= p) {
   STRLEN i = indirect_nextline(t, line_len);