return error if md is NULL

diff --git a/ssl/t1_lib.c b/ssl/t1_lib.c
index 7150171..e4299d8 100644 (file)
--- a/ssl/t1_lib.c
+++ b/ssl/t1_lib.c
@@ -2279,6 +2279,8 @@ static int tls12_find_nid(int id, tls12_lookup *table, size_t tlen)
 int tls12_get_sigandhash(unsigned char *p, const EVP_PKEY *pk, const EVP_MD *md)
        {
        int sig_id, md_id;
 int tls12_get_sigandhash(unsigned char *p, const EVP_PKEY *pk, const EVP_MD *md)
        {
        int sig_id, md_id;

+       if (!md)
+               return 0;

        md_id = tls12_find_id(EVP_MD_type(md), tls12_md,
                                sizeof(tls12_md)/sizeof(tls12_lookup));
        if (md_id == -1)
        md_id = tls12_find_id(EVP_MD_type(md), tls12_md,
                                sizeof(tls12_md)/sizeof(tls12_lookup));
        if (md_id == -1)