Landing: 5da256175a9f

← All landings

Project / Subsystem

gcc / gcc

Date

2026-09-01

Author

Jørgen Kvalsvik

Commit

5da256175a9f7a5f82afcd475ac71eb5c065fac8

Source

github

Perf win

Breaking

View on GitHub →

All attributes

project: gcc
subsystem: gcc
patch_id: —
commit_hash: 5da256175a9f7a5f82afcd475ac71eb5c065fac8
source_type: github
headline: Fix iterator dereference in gcov's tombstone_subsequence_p.
tldr: Prevents potential crash in gcov by guarding iterator dereference.
author: Jørgen Kvalsvik
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • correctness
• gcov
• bugfix
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/5da256175a9f7a5f82afcd475ac71eb5c065fac8
date: 2026-09-01T00:00:00.000Z

This commit adds a guard to prevent dereferencing an iterator past the end of the haystack in gcov.cc’s tombstone_subsequence_p function. This addresses a bug where the haystack could be exhausted before the needle, leading to an ASAN-detected issue.