Fix memleak in EVP_DigestSignFinal/VerifyFinal.

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3658)
(cherry picked from commit 19546246cf44d30043fb17d1899b2c325924ac8b)

diff --git a/crypto/evp/m_sigver.c b/crypto/evp/m_sigver.c
index 3b74f72295155908f1a2ae13c20a8049eaf6b51b..582e563d50312dfbb3d04f717e7f7459ad6927bb 100644 (file)
--- a/crypto/evp/m_sigver.c
+++ b/crypto/evp/m_sigver.c
@@ -109,8 +109,12 @@ int EVP_DigestSignFinal(EVP_MD_CTX *ctx, unsigned char *sigret,
                 r = EVP_DigestFinal_ex(ctx, md, &mdlen);
         } else {
             EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new();
-            if (tmp_ctx == NULL || !EVP_MD_CTX_copy_ex(tmp_ctx, ctx))
+            if (tmp_ctx == NULL)
                 return 0;
+            if (!EVP_MD_CTX_copy_ex(tmp_ctx, ctx)) {
+                EVP_MD_CTX_free(tmp_ctx);
+                return 0;
+            }
             if (sctx)
                 r = tmp_ctx->pctx->pmeth->signctx(tmp_ctx->pctx,
                                                   sigret, siglen, tmp_ctx);
@@ -154,8 +158,12 @@ int EVP_DigestVerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sig,
             r = EVP_DigestFinal_ex(ctx, md, &mdlen);
     } else {
         EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new();
-        if (tmp_ctx == NULL || !EVP_MD_CTX_copy_ex(tmp_ctx, ctx))
+        if (tmp_ctx == NULL)
+            return -1;
+        if (!EVP_MD_CTX_copy_ex(tmp_ctx, ctx)) {
+            EVP_MD_CTX_free(tmp_ctx);
             return -1;
+        }
         if (vctx) {
             r = tmp_ctx->pctx->pmeth->verifyctx(tmp_ctx->pctx,
                                                 sig, siglen, tmp_ctx);