If pk is NULL, the backend would segfault when accessing ->algo and the

following NULL check was never reached.

This problem was found by Coccinelle (null_ref.cocci from coccicheck).

Marti Raudsepp

contrib/pgcrypto/pgp-pubenc.c

@@ -199,7 +199,7 @@ pgp_write_pubenc_sesskey(PGP_Context *ctx, PushFilter *dst)
 	PGP_PubKey *pk = ctx->pub_key;
 	uint8		ver = 3;
 	PushFilter *pkt = NULL;
-	uint8		algo = pk->algo;
+	uint8		algo;
 
 	if (pk == NULL)
 	{
@@ -207,6 +207,8 @@ pgp_write_pubenc_sesskey(PGP_Context *ctx, PushFilter *dst)
 		return PXE_BUG;
 	}
 
+	algo = pk->algo;
+
 	/*
 	 * now write packet
 	 */