Fix pointer arithmetic in ASN1_item_ex_free

The ASN1_ITYPE_SEQUENCE loop does the 90s C thing where we didn't trust
our compilers and manually maintained loop variables as pointers. But
since this code is iterating backwards, it ends up creating a
one-before-the-start pointer. Unlike the one-past-the-end pointer, this
is not legal.

It never does anything with this pointer, and the compiler would need to
see through quite a few functions to observe this UB, so it is unlikely
that this UB had any impact in practice, but we should still fix it. Fix
this by writing this code more straightforwardly.

In doing so, push variable declarations closer to their use, so it's
easier to tell that i is an int.

Bug: 382414689
Change-Id: I35fb2d3aba563c5be86aaca29de31f339bfdc297
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/74089
Auto-Submit: David Benjamin <davidben@google.com>
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>
1 file changed
tree: 7b897de0d55a33c54f0e0974350ed87f12758a97
  1. .bcr/
  2. .github/
  3. cmake/
  4. crypto/
  5. decrepit/
  6. docs/
  7. fuzz/
  8. gen/
  9. include/
  10. infra/
  11. pki/
  12. rust/
  13. ssl/
  14. third_party/
  15. tool/
  16. util/
  17. .bazelignore
  18. .bazelrc
  19. .bazelversion
  20. .clang-format
  21. .gitignore
  22. API-CONVENTIONS.md
  23. BREAKING-CHANGES.md
  24. BUILD.bazel
  25. build.json
  26. BUILDING.md
  27. CMakeLists.txt
  28. codereview.settings
  29. CONTRIBUTING.md
  30. FUZZING.md
  31. go.mod
  32. go.sum
  33. INCORPORATING.md
  34. LICENSE
  35. MODULE.bazel
  36. MODULE.bazel.lock
  37. PORTING.md
  38. PrivacyInfo.xcprivacy
  39. README.md
  40. SANDBOXING.md
  41. 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:

To file a security issue, use the Chromium process and mention in the report this is for BoringSSL. You can ignore the parts of the process that are specific to Chromium/Chrome.

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