Landing: 5d419c69ce2e
Project / Subsystem
gcc / libstdc++
Date
2026-10-01
Author
Jonathan Wakely
Commit
5d419c69ce2e6b86d7da75f18736904885674219
Source
github
Perf win
No
Breaking
No
All attributes
- project
- gcc
- subsystem
- libstdc++
- patch_id
- —
- commit_hash
- 5d419c69ce2e6b86d7da75f18736904885674219
- source_type
- github
- headline
- libstdc++: Fix stack corruption in std::bitset stream extraction
- tldr
- Fixes stack corruption in `std::bitset::operator>>` by replacing `__builtin_alloca` with a stack array.
- author
- Jonathan Wakely
- outcome
- committed
- performance_win
- false
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • libstdc++
- • security
- • bugfix
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-10-01T00:00:00.000Z
This commit resolves a stack corruption vulnerability in the stream extraction operator (operator>>) for std::bitset. The issue was caused by an incorrect argument to __builtin_alloca, which did not properly account for the size or alignment of wide characters. The fix replaces __builtin_alloca with a stack-allocated array, ensuring correct memory management and preventing stack corruption.