Avoid another NULL+0 in BIO_s_mem

That NULL+0 is forbidden is still an awful language bug in C (fixed in
C++), but this particular instance could have been written without
pointer arithmetic. While I'm here, tidy pointers a bit:

- No need to cast pointers to char* when we're writing to void* anyway

- BIO_C_GET_BUF_MEM_PTR is technically a strict aliasing violation. The
  pointer points to a BUF_MEM*, not a char*, so we should not write to
  it as a char**.

- C casts from void* freely and we've usually omitted the cast in that
  case. (Though if we ever move libcrypto to C++, that'll all have to
  change.)

Bug: b:286384999
Change-Id: I16d7da675d61f726f259fc9a3cc4a6fce2d6d1fd
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/60605
Reviewed-by: Bob Beck <bbe@google.com>
Commit-Queue: Bob Beck <bbe@google.com>
Auto-Submit: David Benjamin <davidben@google.com>
2 files changed
tree: 385fa65ed64673713f25c250d022c895e2f4c36e
  1. .github/
  2. cmake/
  3. crypto/
  4. decrepit/
  5. fuzz/
  6. include/
  7. rust/
  8. ssl/
  9. third_party/
  10. tool/
  11. util/
  12. .clang-format
  13. .gitignore
  14. API-CONVENTIONS.md
  15. BREAKING-CHANGES.md
  16. BUILDING.md
  17. CMakeLists.txt
  18. codereview.settings
  19. CONTRIBUTING.md
  20. FUZZING.md
  21. go.mod
  22. go.sum
  23. INCORPORATING.md
  24. LICENSE
  25. PORTING.md
  26. README.md
  27. SANDBOXING.md
  28. sources.cmake
  29. STYLE.md
README.md

BoringSSL

BoringSSL is a fork of OpenSSL that is designed to meet Google's needs.

Although BoringSSL is an open source project, it is not intended for general use, as OpenSSL is. We don't recommend that third parties depend upon it. Doing so is likely to be frustrating because there are no guarantees of API or ABI stability.

Programs ship their own copies of BoringSSL when they use it and we update everything as needed when deciding to make API changes. This allows us to mostly avoid compromises in the name of compatibility. It works for us, but it may not work for you.

BoringSSL arose because Google used OpenSSL for many years in various ways and, over time, built up a large number of patches that were maintained while tracking upstream OpenSSL. As Google's product portfolio became more complex, more copies of OpenSSL sprung up and the effort involved in maintaining all these patches in multiple places was growing steadily.

Currently BoringSSL is the SSL library in Chrome/Chromium, Android (but it's not part of the NDK) and a number of other apps/programs.

Project links:

There are other files in this directory which might be helpful: