Don't crash if an unrecognised digest is used with dsa_paramgen_md

Reviewed-by: Rich Salz <rsalz@openssl.org> (Merged from #5800)
openssl · Apr 5, 2018 · 06d3b48 · 06d3b48
1 parent fdb8113
commit 06d3b48
Showing 1 changed file with 7 additions and 1 deletion.
diff --git a/crypto/dsa/dsa_pmeth.c b/crypto/dsa/dsa_pmeth.c
@@ -189,9 +189,15 @@ static int pkey_dsa_ctrl_str(EVP_PKEY_CTX *ctx,
                                  NULL);
     }
     if (strcmp(type, "dsa_paramgen_md") == 0) {
+        const EVP_MD *md = EVP_get_digestbyname(value);
+
+        if (md == NULL) {
+            DSAerr(DSA_F_PKEY_DSA_CTRL_STR, DSA_R_INVALID_DIGEST_TYPE);
+            return 0;
+        }
         return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DSA, EVP_PKEY_OP_PARAMGEN,
                                  EVP_PKEY_CTRL_DSA_PARAMGEN_MD, 0,
-                                 (void *)EVP_get_digestbyname(value));
+                                 (void *)md);
     }
     return -2;
 }