From bc6f15fec658f82ea4b4d11874ab53f13898048d Mon Sep 17 00:00:00 2001
From: WillChilds-Klein <willck93@gmail.com>
Date: Mon, 30 Sep 2024 16:15:11 +0000
Subject: [PATCH] Cover basic error cases, no init on new/get

---
 crypto/pkcs7/bio/bio_deprecated_test.cc | 10 +++++++++-
 crypto/pkcs7/bio/md.c                   |  2 --
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/crypto/pkcs7/bio/bio_deprecated_test.cc b/crypto/pkcs7/bio/bio_deprecated_test.cc
index 008d2eba5b0..69752ce7940 100644
--- a/crypto/pkcs7/bio/bio_deprecated_test.cc
+++ b/crypto/pkcs7/bio/bio_deprecated_test.cc
@@ -54,8 +54,10 @@ TEST_P(BIODeprecatedTest, MessageDigestBasic) {
   const EVP_MD *md = GetParam().md();
   ASSERT_TRUE(md);
 
+  // Simple initialization and error cases
   bio_md.reset(BIO_new(BIO_f_md()));
   ASSERT_TRUE(bio_md);
+  EXPECT_FALSE(BIO_reset(bio_md.get()));
   EXPECT_TRUE(BIO_set_md(bio_md.get(), (EVP_MD *)md));
   EVP_MD_CTX *ctx_tmp;  // |bio_md| owns the context, we just take a ref here
   EXPECT_TRUE(BIO_get_md_ctx(bio_md.get(), &ctx_tmp));
@@ -67,6 +69,11 @@ TEST_P(BIODeprecatedTest, MessageDigestBasic) {
   EXPECT_FALSE(BIO_ctrl(bio_md.get(), BIO_CTRL_DUP, 0, nullptr));
   EXPECT_FALSE(BIO_ctrl(bio_md.get(), BIO_CTRL_GET_CALLBACK, 0, nullptr));
   EXPECT_FALSE(BIO_ctrl(bio_md.get(), BIO_CTRL_SET_CALLBACK, 0, nullptr));
+  EXPECT_FALSE(BIO_read(bio_md.get(), buf, 0));
+  EXPECT_FALSE(BIO_write(bio_md.get(), buf, 0));
+  EXPECT_EQ(0UL, BIO_number_read(bio_md.get()));
+  EXPECT_EQ(0UL, BIO_number_written(bio_md.get()));
+  EXPECT_FALSE(BIO_gets(bio_md.get(), (char *)buf, EVP_MD_size(md) - 1));
 
   // Write-through digest BIO
   bio_md.reset(BIO_new(BIO_f_md()));
@@ -146,9 +153,9 @@ TEST_P(BIODeprecatedTest, MessageDigestRandomized) {
 
   const size_t block_size = EVP_MD_block_size(md);
   std::vector<std::vector<size_t>> io_patterns = {
+      {},
       {0},
       {1},
-      {},
       {8, 8, 8, 8},
       {block_size - 1, 1, block_size + 1, block_size, block_size - 1},
       {4, 1, 5, 3, 2, 0, 1, sizeof(message_buf), 133, 4555, 22, 4, 7964, 1234},
@@ -209,6 +216,7 @@ TEST_P(BIODeprecatedTest, MessageDigestRandomized) {
       int rsize = BIO_read(bio.get(), message_buf, io_size);
       EXPECT_EQ((int)io_size, rsize);
     }
+    EXPECT_TRUE(BIO_eof(bio.get()));
     digest_size =
         BIO_gets(bio_md.get(), (char *)digest_buf, sizeof(digest_buf));
     ASSERT_EQ(EVP_MD_CTX_size(ctx.get()), digest_size);
diff --git a/crypto/pkcs7/bio/md.c b/crypto/pkcs7/bio/md.c
index 263ebfc72c0..5a21b8cdf7b 100644
--- a/crypto/pkcs7/bio/md.c
+++ b/crypto/pkcs7/bio/md.c
@@ -33,7 +33,6 @@ static int md_new(BIO *b) {
     return 0;
   }
 
-  BIO_set_init(b, 1);
   BIO_set_data(b, ctx);
 
   return 1;
@@ -131,7 +130,6 @@ static long md_ctrl(BIO *b, int cmd, long num, void *ptr) {
     case BIO_C_GET_MD_CTX:
       pctx = ptr;
       *pctx = ctx;
-      BIO_set_init(b, 1);
       break;
     case BIO_C_SET_MD:
       md = ptr;