| commit | c27927e372f0785f3303e8fad94b85945e2c97b7 | [log] [tgz] |
|---|---|---|
| author | Willem de Bruijn <willemb@google.com> | Thu Aug 10 12:41:58 2017 -0400 |
| committer | David S. Miller <davem@davemloft.net> | Thu Aug 10 09:52:12 2017 -0700 |
| tree | 3602b8aeb2cc349ba954d4ff17028d364e395c56 | |
| parent | 85f1bd9a7b5a79d5baa8bf44af19658f7bf77bfa [diff] |
packet: fix tp_reserve race in packet_set_ring
Updates to tp_reserve can race with reads of the field in
packet_set_ring. Avoid this by holding the socket lock during
updates in setsockopt PACKET_RESERVE.
This bug was discovered by syzkaller.
Fixes: 8913336a7e8d ("packet: add PACKET_RESERVE sockopt")
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>