Landing: a068d1b7c9da
Project / Subsystem
gcc / libstdc++
Date
2026-01-07
Author
Tomasz Kamiński
Commit
a068d1b7c9da60a9b21efa4baf65f7325211be12
Source
github
Perf win
No
Breaking
No
All attributes
- project
- gcc
- subsystem
- libstdc++
- patch_id
- —
- commit_hash
- a068d1b7c9da60a9b21efa4baf65f7325211be12
- source_type
- github
- headline
- Libstdc++ Fixes Potential Null-Dereference in istreambuf_iterator
- tldr
- Libstdc++ now avoids a potential null-dereference warning in `istreambuf_iterator` by adjusting how the internal stream buffer pointer is handled.
- author
- Tomasz Kamiński
- outcome
- committed
- performance_win
- false
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • libstdc++
- • iterator
- • streambuf
- • null-dereference
- • bugfix
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-01-07T00:00:00.000Z
Libstdc++ now clears the internal stream buffer pointer (_M_sbuf) in istreambuf_iterator::operator++() instead of _M_get(). This change addresses a false-positive null-dereference warning that could occur when incrementing an iterator that had previously reached the end of the stream. This also allows removing mutable from _M_sbuf, improving conformance with the C++11 standard regarding data races.