commit 8fd19b20beca97a2ef804058f099cf54f12f7614
author Dr. Stephen Henson <steve@openssl.org> Fri Feb 10 04:22:18 2017 +0000
committer Dr. Stephen Henson <steve@openssl.org> Fri Feb 10 20:08:35 2017 +0000
tree 88bf4e68a7d10ff94bc4af7ba7ac70bd3d2e71d3
parent 88be429f2ed04f0acc71f7fd5456174c274f2f76

Check index >= 0 as 0 is a valid index.

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2587)

ssl/t1_lib.c

diff --git a/ssl/t1_lib.c b/ssl/t1_lib.c
index 43340d4..d6a841a 100644
--- a/ssl/t1_lib.c
+++ b/ssl/t1_lib.c
@@ -1601,7 +1601,7 @@
         if (SSL_IS_TLS13(s) && sigptr->sig == EVP_PKEY_RSA)
             continue;
         idx = tls12_get_pkey_idx(sigptr->sig);
-        if (idx > 0 && pmd[idx] == NULL) {
+        if (idx >= 0 && pmd[idx] == NULL) {
             md = ssl_md(sigptr->hash_idx);
             pmd[idx] = md;
             pvalid[idx] = CERT_PKEY_EXPLICIT_SIGN;