From a1660045fc9e88b8f6a2615f3941177fcaa5541d Mon Sep 17 00:00:00 2001
From: Doug Hogan <hogand@users.noreply.github.com>
Date: Thu, 3 Jan 2019 15:45:34 -0800
Subject: Revamp do_exor()

* Add additional error checking.
---
 lib/crypto/c_src/math.c | 24 +++++++++++++++++-------
 1 file changed, 17 insertions(+), 7 deletions(-)

(limited to 'lib/crypto/c_src/math.c')

diff --git a/lib/crypto/c_src/math.c b/lib/crypto/c_src/math.c
index 7d7d146ca9..a7a385e404 100644
--- a/lib/crypto/c_src/math.c
+++ b/lib/crypto/c_src/math.c
@@ -24,20 +24,30 @@ ERL_NIF_TERM do_exor(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
 {/* (Data1, Data2) */
     ErlNifBinary d1, d2;
     unsigned char* ret_ptr;
-    int i;
+    size_t i;
     ERL_NIF_TERM ret;
 
-    if (!enif_inspect_iolist_as_binary(env,argv[0], &d1)
-	|| !enif_inspect_iolist_as_binary(env,argv[1], &d2)
-	|| d1.size != d2.size) {
-	return enif_make_badarg(env);
-    }
-    ret_ptr = enif_make_new_binary(env, d1.size, &ret);
+    if (argc != 2)
+        goto bad_arg;
+    if (!enif_inspect_iolist_as_binary(env, argv[0], &d1))
+        goto bad_arg;
+    if (!enif_inspect_iolist_as_binary(env, argv[1], &d2))
+        goto bad_arg;
+    if (d1.size != d2.size)
+        goto bad_arg;
+
+    if ((ret_ptr = enif_make_new_binary(env, d1.size, &ret)) == NULL)
+        goto err;
 
     for (i=0; i<d1.size; i++) {
 	ret_ptr[i] = d1.data[i] ^ d2.data[i];
     }
+
     CONSUME_REDS(env,d1);
     return ret;
+
+ bad_arg:
+ err:
+    return enif_make_badarg(env);
 }
 
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