Add testing of RDONLY memory BIOs

Reviewed-by: Bernd Edlinger <bernd.edlinger@hotmail.de>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/8649)

2 files changed, 80 insertions, 0 deletions

diff --git a/crypto/bio/bss_mem.c b/crypto/bio/bss_mem.c
index 51fae3b2f0..a7f2bfbae0 100644
--- a/crypto/bio/bss_mem.c
+++ b/crypto/bio/bss_mem.c
@@ -204,6 +204,7 @@ static int mem_read(BIO *b, char *out, int outl)
     if ((out != NULL) && (ret > 0)) {
         memcpy(out, bm->data, ret);
         bm->length -= ret;
+        bm->max -= ret;
         bm->data += ret;
     } else if (bm->length == 0) {
         ret = b->num;
diff --git a/test/bio_memleak_test.c b/test/bio_memleak_test.c
index c11455fc60..bdc6d68c7d 100644
--- a/test/bio_memleak_test.c
+++ b/test/bio_memleak_test.c
@@ -68,6 +68,83 @@ finish:
     return ok;
 }
 
+static int test_bio_new_mem_buf(void)
+{
+    int ok = 0;
+    BIO *bio;
+    BUF_MEM *bufmem;
+    char data[16];
+
+    bio = BIO_new_mem_buf("Hello World\n", 12);
+    if (!TEST_ptr(bio))
+        goto finish;
+    if (!TEST_int_eq(BIO_read(bio, data, 5), 5))
+        goto finish;
+    if (!TEST_mem_eq(data, 5, "Hello", 5))
+        goto finish;
+    if (!TEST_int_gt(BIO_get_mem_ptr(bio, &bufmem), 0))
+        goto finish;
+    if (!TEST_int_lt(BIO_write(bio, "test", 4), 0))
+        goto finish;
+    if (!TEST_int_eq(BIO_read(bio, data, 16), 7))
+        goto finish;
+    if (!TEST_mem_eq(data, 7, " World\n", 7))
+        goto finish;
+    if (!TEST_int_gt(BIO_reset(bio), 0))
+        goto finish;
+    if (!TEST_int_eq(BIO_read(bio, data, 16), 12))
+        goto finish;
+    if (!TEST_mem_eq(data, 12, "Hello World\n", 12))
+        goto finish;
+    ok = 1;
+
+finish:
+    BIO_free(bio);
+    return ok;
+}
+
+static int test_bio_rdonly_mem_buf(void)
+{
+    int ok = 0;
+    BIO *bio, *bio2 = NULL;
+    BUF_MEM *bufmem;
+    char data[16];
+
+    bio = BIO_new_mem_buf("Hello World\n", 12);
+    if (!TEST_ptr(bio))
+        goto finish;
+    if (!TEST_int_eq(BIO_read(bio, data, 5), 5))
+        goto finish;
+    if (!TEST_mem_eq(data, 5, "Hello", 5))
+        goto finish;
+    if (!TEST_int_gt(BIO_get_mem_ptr(bio, &bufmem), 0))
+        goto finish;
+    (void)BIO_set_close(bio, BIO_NOCLOSE);
+
+    bio2 = BIO_new(BIO_s_mem());
+    if (!TEST_ptr(bio2))
+        goto finish;
+    BIO_set_mem_buf(bio2, bufmem, BIO_CLOSE);
+    BIO_set_flags(bio2, BIO_FLAGS_MEM_RDONLY);
+
+    if (!TEST_int_eq(BIO_read(bio2, data, 16), 7))
+        goto finish;
+    if (!TEST_mem_eq(data, 7, " World\n", 7))
+        goto finish;
+    if (!TEST_int_gt(BIO_reset(bio2), 0))
+        goto finish;
+    if (!TEST_int_eq(BIO_read(bio2, data, 16), 7))
+        goto finish;
+    if (!TEST_mem_eq(data, 7, " World\n", 7))
+        goto finish;
+    ok = 1;
+
+finish:
+    BIO_free(bio);
+    BIO_free(bio2);
+    return ok;
+}
+
 int global_init(void)
 {
     CRYPTO_set_mem_debug(1);
@@ -79,5 +156,7 @@ int setup_tests(void)
 {
     ADD_TEST(test_bio_memleak);
     ADD_TEST(test_bio_get_mem);
+    ADD_TEST(test_bio_new_mem_buf);
+    ADD_TEST(test_bio_rdonly_mem_buf);
     return 1;
 }