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| author | Frank Mehnert <frank.mehnert@kernkonzept.com> | 2025-01-07 13:09:50 +0100 |
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| committer | Waldemar Brodkorb <wbx@openadk.org> | 2025-01-07 13:28:17 +0100 |
| commit | b92057584f09d442f27b9177b12fe6fdf36ddbaf (patch) | |
| tree | 10f251b3ce388177ba027e5121f42003ab98aad5 /libc/sysdeps/linux/nios2/__longjmp.S | |
| parent | 1de51fb74b68a94207384021a878c1a3035d2aff (diff) | |
fix possible overflow in pointer arithmetics strnlen()
It is undefined behavior to compare two pointers belonging to different
objects. This includes the case where the addition overflows. Clang-20
seems to follow this rule more eagerly and optimizes away the old test.
Fix the test by performing the addition on uintptr_t values rather than
on on char pointers.
See also https://github.com/llvm/llvm-project/issues/121909.
Signed-off-by: Marcus Haehnel <marcus.haehnel@kernkonzept.com>
Diffstat (limited to 'libc/sysdeps/linux/nios2/__longjmp.S')
0 files changed, 0 insertions, 0 deletions