Date: Thu, 23 Apr 2009 13:08:47 +0000 (UTC) From: Robert Watson <rwatson@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/net if.c if_var.h Message-ID: <200904231308.n3ND8weG006847@repoman.freebsd.org>
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rwatson 2009-04-23 13:08:47 UTC
FreeBSD src repository
Modified files:
sys/net if.c if_var.h
Log:
SVN rev 191423 on 2009-04-23 13:08:47Z by rwatson
Add ifunit_ref(), a version of ifunit(), that returns not just an
interface pointer, but also a reference to it.
Modify ifioctl() to use ifunit_ref(), holding the reference until
all ioctls, etc, have completed.
This closes a class of reader-writer races in which interfaces
could be removed during long-running ioctls, leading to crashes.
Many other consumers of ifunit() should now use ifunit_ref() to
avoid similar races.
MFC after: 3 weeks
Revision Changes Path
1.325 +28 -6 src/sys/net/if.c
1.137 +1 -0 src/sys/net/if_var.h
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