From: Ondřej Surý <ondrej@isc.org>
Date: Tue, 4 Nov 2025 18:53:09 +0000 (+0100)
Subject: fix: dev: Only unlink from SIEVE LRU if it is still linked
X-Git-Tag: v9.21.15~5
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=28926f210e10a9c482ebba90a33875bd63dfb3b6;p=thirdparty%2Fbind9.git

fix: dev: Only unlink from SIEVE LRU if it is still linked

Under the overmem conditions, the header could get unlinked from the
SIEVE LRU using a different path.  This could lead to double-unlink
which causes assertion failure.  Add a guard to ISC_SIEVE_UNLINK() to
unlink only still linked headers.

Closes #5606

Merge branch '5606-fix-assertion-failure-in-overmem-cleaning' into 'main'

See merge request isc-projects/bind9!11166
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28926f210e10a9c482ebba90a33875bd63dfb3b6