Fix NULL pointer deref when there is no message data whatsoever

diff --git a/src/src/pdkim/pdkim.c b/src/src/pdkim/pdkim.c
index d875e1f89cf145b8b254bae12abb62b1a15791b1..2cf323366a473c3c8c72eb60dcf4ca66bd93078d 100644 (file)
--- a/src/src/pdkim/pdkim.c
+++ b/src/src/pdkim/pdkim.c
@@ -20,7 +20,7 @@
  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-/* $Cambridge: exim/src/src/pdkim/pdkim.c,v 1.7 2009/11/09 14:19:48 tom Exp $ */
+/* $Cambridge: exim/src/src/pdkim/pdkim.c,v 1.8 2009/11/14 14:01:16 tom Exp $ */
 
 #include <stdlib.h>
 #include <stdio.h>
@@ -1267,7 +1267,7 @@ DLLEXPORT int pdkim_feed_finish(pdkim_ctx *ctx, pdkim_signature **return_signatu
   /* Check if we must still flush a (partial) header. If that is the
      case, the message has no body, and we must compute a body hash
      out of '<CR><LF>' */
-  if (ctx->cur_header->len) {
+  if (ctx->cur_header && ctx->cur_header->len) {
     int rc = pdkim_header_complete(ctx);
     if (rc != PDKIM_OK) return rc;
     pdkim_update_bodyhash(ctx,"\r\n",2);