test: reinitialize buffer length in test_EVP_SM2

Reviewed-by: Viktor Dukhovni <viktor@openssl.org>
Reviewed-by: Eugene Syromiatnikov <esyr@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.foundation>
MergeDate: Wed May  6 16:51:02 2026
(Merged from https://github.com/openssl/openssl/pull/30614)

diff --git a/test/evp_extra_test.c b/test/evp_extra_test.c
index 88c156147094c83bf41270f1e751cc0927752f37..61d08c1374c784c69bed36eccd743b741cdb07cd 100644 (file)
--- a/test/evp_extra_test.c
+++ b/test/evp_extra_test.c
@@ -2689,8 +2689,10 @@ static int test_EVP_SM2(void)
 #ifndef OPENSSL_NO_X963KDF
     uint8_t ciphertext[128];
     size_t ctext_len = sizeof(ciphertext);
+    size_t ctext_len_param = 0;
     uint8_t plaintext[8];
     size_t ptext_len = sizeof(plaintext);
+    size_t ptext_len_param = 0;
     OSSL_PARAM sparams[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
     OSSL_PARAM gparams[2] = { OSSL_PARAM_END, OSSL_PARAM_END };
     int i;
@@ -2818,7 +2820,8 @@ static int test_EVP_SM2(void)
         if (!TEST_true(EVP_PKEY_CTX_set_params(cctx, sparams)))
             goto done;
 
-        if (!TEST_true(EVP_PKEY_encrypt(cctx, ciphertext, &ctext_len, kMsg,
+        ctext_len_param = ctext_len;
+        if (!TEST_true(EVP_PKEY_encrypt(cctx, ciphertext, &ctext_len_param, kMsg,
                 sizeof(kMsg))))
             goto done;
 
@@ -2828,8 +2831,9 @@ static int test_EVP_SM2(void)
         if (!TEST_true(EVP_PKEY_CTX_set_params(cctx, sparams)))
             goto done;
 
-        if (!TEST_int_gt(EVP_PKEY_decrypt(cctx, plaintext, &ptext_len, ciphertext,
-                             ctext_len),
+        ptext_len_param = ptext_len;
+        if (!TEST_int_gt(EVP_PKEY_decrypt(cctx, plaintext, &ptext_len_param, ciphertext,
+                             ctext_len_param),
                 0))
             goto done;
 
@@ -2849,7 +2853,7 @@ static int test_EVP_SM2(void)
             goto done;
         }
 
-        if (!TEST_true(ptext_len == sizeof(kMsg)))
+        if (!TEST_true(ptext_len_param == sizeof(kMsg)))
             goto done;
 
         if (!TEST_true(memcmp(plaintext, kMsg, sizeof(kMsg)) == 0))