From c898bd4f5880bd7ddbf5987024c2748eae3d88a7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Petr=20P=C3=ADsa=C5=99?= <ppisar@redhat.com>
Date: Wed, 12 Mar 2014 10:17:16 +0100
Subject: [PATCH] Check for ISA when invoking methods
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

After:

use Digest::SHA;
my $d=Digest::SHA->add(qq(a));

calling $d->hashsize() and other methods resulted in crash.

This is relevant patch from Digest-SHA-5.87.

Perl RT#121421
<https://bugzilla.redhat.com/show_bug.cgi?id=1075478>

Signed-off-by: Petr Písař <ppisar@redhat.com>
---
 SHA.xs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/SHA.xs b/SHA.xs
index 3caf8ef..69908a0 100644
--- a/SHA.xs
+++ b/SHA.xs
@@ -34,6 +34,8 @@ shaclose(s)
 CODE:
 	RETVAL = shaclose(s);
 	sv_setiv(SvRV(ST(0)), 0);
+OUTPUT:
+	RETVAL
 
 int
 shadump(file, s)
@@ -186,6 +188,8 @@ PREINIT:
 	SHA *state;
 	int result;
 PPCODE:
+	if (!sv_isa(self, "Digest::SHA"))
+		XSRETURN_UNDEF;
 	state = INT2PTR(SHA *, SvIV(SvRV(SvRV(self))));
 	result = ix ? shaalg(state) : shadsize(state) << 3;
 	ST(0) = sv_2mortal(newSViv(result));
@@ -200,6 +204,8 @@ PREINIT:
 	STRLEN len;
 	SHA *state;
 PPCODE:
+	if (!sv_isa(self, "Digest::SHA"))
+		XSRETURN_UNDEF;
 	state = INT2PTR(SHA *, SvIV(SvRV(SvRV(self))));
 	for (i = 1; i < items; i++) {
 		data = (unsigned char *) (SvPVbyte(ST(i), len));
@@ -224,6 +230,8 @@ PREINIT:
 	SHA *state;
 	char *result;
 PPCODE:
+	if (!sv_isa(self, "Digest::SHA"))
+		XSRETURN_UNDEF;
 	state = INT2PTR(SHA *, SvIV(SvRV(SvRV(self))));
 	shafinish(state);
 	len = 0;
-- 
1.8.5.3