Fix bad use of library, copying string over itself

[exim.git] / src / src / arc.c

diff --git a/src/src/arc.c b/src/src/arc.c
index 787c6e1e203f6b371778d04ca96446151b58b833..80bb30e0373bea2e838d45e05521779eddfa84c8 100644 (file)
--- a/src/src/arc.c
+++ b/src/src/arc.c
@@ -984,16 +984,13 @@ return NULL;
 static const uschar *
 arc_verify_seals(arc_ctx * ctx)
 {
-arc_set * as = ctx->arcset_chain;
+arc_set * as = ctx->arcset_chain_last;
 
 if (!as)
   return US"none";
 
-while (as)
-  {
-  if (arc_seal_verify(ctx, as)) return US"fail";
-  as = as->next;
-  }
+for ( ; as; as = as->prev) if (arc_seal_verify(ctx, as)) return US"fail";
+
 DEBUG(D_acl) debug_printf("ARC: AS vfy overall pass\n");
 return NULL;
 }
@@ -1258,6 +1255,9 @@ if (  (errstr = exim_dkim_signing_init(privkey, &sctx))
    || (errstr = exim_dkim_sign(&sctx, hm, &hhash, sig)))
   {
   log_write(0, LOG_MAIN, "ARC: %s signing: %s\n", why, errstr);
+  DEBUG(D_transport)
+    debug_printf("private key, or private-key file content, was: '%s'\n",
+      privkey);
   return FALSE;
   }
 return TRUE;
@@ -1696,12 +1696,13 @@ g = arc_sign_append_ams(g, &arc_sign_ctx, instance, identity, selector,
         including self (but with an empty b= in self)
 */
 
-g = arc_sign_prepend_as(g, &arc_sign_ctx, instance, identity, selector, &ar,
+if (g)
+  g = arc_sign_prepend_as(g, &arc_sign_ctx, instance, identity, selector, &ar,
       privkey, options);
 
 /* Finally, append the dkim headers and return the lot. */
 
-g = string_catn(g, sigheaders->s, sigheaders->ptr);
+if (sigheaders) g = string_catn(g, sigheaders->s, sigheaders->ptr);
 (void) string_from_gstring(g);
 gstring_reset_unused(g);
 return g;
@@ -1839,7 +1840,7 @@ if (arc_state)
       US" arc.oldest-pass=", string_sprintf("%d", arc_oldest_pass));
 
     if (sender_host_address)
-      g = string_append(g, 2, US" smtp.client-ip=", sender_host_address);
+      g = string_append(g, 2, US" smtp.remote-ip=", sender_host_address);
     }
   else if (arc_state_reason)
     g = string_append(g, 3, US" (", arc_state_reason, US")");