ARC: harden against malformed headers

1 files changed, 2 insertions, 0 deletions

diff --git a/src/src/arc.c b/src/src/arc.c
index 6c4bcc641..e7ebb9719 100644
--- 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);