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Carl Henrik Holth Lunde found a bug in SSSD resolver code in case the file descriptor we use to integrate c-ares with libtevent is both readable and writable at the same time. In this case, we process the request twice, both for TEVENT_FD_WRITE and TEVENT_FD_READ. The first callback processing frees the internal watch structure and the second callback invocation accesses invalid memory.
Carl also proposed a patch for this bug himself.
Linked to Bugzilla bug: https://bugzilla.redhat.com/show_bug.cgi?id=1400422
rhbz: => [https://bugzilla.redhat.com/show_bug.cgi?id=1400422 1400422]
Fields changed
version: 1.14.2 => 1.13.4
milestone: NEEDS_TRIAGE => SSSD 1.13.5
resolution: => fixed status: new => closed
Metadata Update from @jhrozek: - Issue set to the milestone: SSSD 1.13.5
SSSD is moving from Pagure to Github. This means that new issues and pull requests will be accepted only in SSSD's github repository.
This issue has been cloned to Github and is available here: - https://github.com/SSSD/sssd/issues/4283
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