Use locking around version flag updates when handling IN6P_IPV6_V6ONLY.
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Authored by markj on Oct 1 2019, 11:26 PM.

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tuexen
ae
bz

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rS353295: Improve locking in the IPV6_V6ONLY socket option handler.

Summary

I am tracking down a race in this area and noticed this bug. There are
places where we do unlocked reads of the flags, but it is certainly
incorrect to update them without a lock on the PCB.

While here, simplify a comment.

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rS FreeBSD src repository - subversion

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Event Timeline

markj created this revision.Oct 1 2019, 11:26 PM

Herald added a subscriber: ae. · View Herald TranscriptOct 1 2019, 11:26 PM

Harbormaster completed remote builds in B26820: Diff 62813.Oct 1 2019, 11:26 PM

markj added reviewers: tuexen, ae, bz.Oct 1 2019, 11:27 PM

This revision was not accepted when it landed; it landed in state Needs Review.Oct 7 2019, 11:35 PM

Closed by commit rS353295: Improve locking in the IPV6_V6ONLY socket option handler. (authored by markj). · Explain Why

This revision was automatically updated to reflect the committed changes.

markj added a commit: rS353295: Improve locking in the IPV6_V6ONLY socket option handler..

Herald added a subscriber: imp. · View Herald TranscriptOct 7 2019, 11:35 PM

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head/

sys/

netinet6/

ip6_output.c

19 lines

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head/sys/netinet6/ip6_output.c

Use locking around version flag updates when handling IN6P_IPV6_V6ONLY.ClosedPublicActions