From ab4171e37fcbddc3461d0f95f3f4f8ac1ba0675e Mon Sep 17 00:00:00 2001
From: Frank Denis <github@pureftpd.org>
Date: Tue, 13 Jan 2015 16:26:58 +0100
Subject: [PATCH] Error checking

---
 src/libsodium/crypto_sign/ed25519/ref10/keypair.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/libsodium/crypto_sign/ed25519/ref10/keypair.c b/src/libsodium/crypto_sign/ed25519/ref10/keypair.c
index 2268cd60..b6335f39 100644
--- a/src/libsodium/crypto_sign/ed25519/ref10/keypair.c
+++ b/src/libsodium/crypto_sign/ed25519/ref10/keypair.c
@@ -46,7 +46,9 @@ int crypto_sign_ed25519_pk_to_curve25519(unsigned char *curve25519_pk,
     fe    x;
     fe    one_minus_y;
 
-    ge_frombytes_negate_vartime(&A, ed25519_pk);
+    if (ge_frombytes_negate_vartime(&A, ed25519_pk) != 0) {
+        return -1;
+    }
     fe_1(one_minus_y);
     fe_sub(one_minus_y, one_minus_y, A.Y);
     fe_invert(one_minus_y, one_minus_y);