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Commit c27927e3 authored by Willem de Bruijn's avatar Willem de Bruijn Committed by David S. Miller
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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: 8913336a ("packet: add PACKET_RESERVE sockopt")
Reported-by: default avatarAndrey Konovalov <andreyknvl@google.com>
Signed-off-by: default avatarWillem de Bruijn <willemb@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 85f1bd9a
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