Eric Dumazet c846c56881 packet: fix races in fanout_add() ...

Multiple threads can call fanout_add() at the same time.

We need to grab fanout_mutex earlier to avoid races that could
lead to one thread freeing po->rollover that was set by another thread.

Do the same in fanout_release(), for peace of mind, and to help us
finding lockdep issues earlier.

Fixes: dc99f60069 ("packet: Add fanout support.")
Fixes: 0648ab70afe6 ("packet: rollover prepare: per-socket state")
Change-Id: I4dd51db703494cc8f9c5a1ab86a9a437610f4d4a
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
[bwh: Backported to 3.2:
 - No rollover queue stats
 - Adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
CVE-2017-6346
Signed-off-by: Kevin F. Haggerty <haggertk@lineageos.org>

2019-08-06 12:26:32 +02:00

..

af_packet.c

packet: fix races in fanout_add()

2019-08-06 12:26:32 +02:00

Kconfig

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Makefile

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