Check strtoul return for overflow error in GetUnsigned()

Currently, GetUnsigned() calls strtoul and checks whether the resulting
unsigned long int is greater than UINT_MAX. This implicitly assumes that
UINT_MAX < ULONG_MAX.

Problematically, `unsigned long int` and `unsigned` have the same size
on Windows [0] and on 32-bit architectures.

For correctness, we now check whether strtoul failed because it would
overflow the unsigned long int before checking whether the value fits in
an unsigned type.

[0]: https://docs.microsoft.com/en-us/cpp/cpp/data-type-ranges?view=msvc-160

Change-Id: I49702febf4543bfb7991592717443e0b2adb954f
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/48545
Commit-Queue: Dan McArdle <dmcardle@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
Reviewed-by: David Benjamin <davidben@google.com>
1 file changed
tree: 3f09718ace7bc551fef129c80ddf71a5ffcc4fd3
  1. .clang-format
  2. .github/
  3. .gitignore
  4. API-CONVENTIONS.md
  5. BREAKING-CHANGES.md
  6. BUILDING.md
  7. CMakeLists.txt
  8. CONTRIBUTING.md
  9. FUZZING.md
  10. INCORPORATING.md
  11. LICENSE
  12. PORTING.md
  13. README.md
  14. SANDBOXING.md
  15. STYLE.md
  16. codereview.settings
  17. crypto/
  18. decrepit/
  19. fuzz/
  20. go.mod
  21. go.sum
  22. include/
  23. sources.cmake
  24. ssl/
  25. third_party/
  26. tool/
  27. util/
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: