vendor/libsodium/src/libsodium/crypto_sign/ed25519/ref10/obsolete.c in rbnacl-libsodium-1.0.13 vs vendor/libsodium/src/libsodium/crypto_sign/ed25519/ref10/obsolete.c in rbnacl-libsodium-1.0.15

@@ -81,10 +81,10 @@
     ge_p3              A;
     ge_p3              R;
     ge_p3              cs3;
 
     *mlen_p = 0;
-    if (smlen < 64 || smlen > SIZE_MAX) {
+    if (smlen < 64 || smlen - 64 > crypto_sign_edwards25519sha512batch_MESSAGEBYTES_MAX) {
         return -1;
     }
     mlen = smlen - 64;
     if (sm[smlen - 1] & 224) {
         return -1;