ARC: harden against malformed headers

diff --git a/src/src/arc.c b/src/src/arc.c
index 6c4bcc641e924e17bb8b37aeeb03180ccc213788..e7ebb97196db5110f6114ff969df6d152ff58abc 100644 (file)
--- a/src/src/arc.c
+++ b/src/src/arc.c
@@ -260,6 +260,7 @@ while ((c = *s))
          while ((c = *++s) && c != ';')
            if (c != ' ' && c != '\t' && c != '\n' && c != '\r')
              g = string_catn(g, s, 1);
+         if (!g) return US"no b= value";
          al->b.data = string_from_gstring(g);
          al->b.len = g->ptr;
          gstring_reset_unused(g);
@@ -276,6 +277,7 @@ while ((c = *s))
          while ((c = *++s) && c != ';')
            if (c != ' ' && c != '\t' && c != '\n' && c != '\r')
              g = string_catn(g, s, 1);
+         if (!g) return US"no bh= value";
          al->bh.data = string_from_gstring(g);
          al->bh.len = g->ptr;
          gstring_reset_unused(g);