net/packet: fix overflow in check for tp_frame_nr
[ Upstream commit 8f8d28e4d6d815a391285e121c3a53a0b6cb9e7b ] When calculating rb->frames_per_block * req->tp_block_nr the result can overflow. Add a check that tp_block_size * tp_block_nr <= UINT_MAX. Since frames_per_block <= tp_block_size, the expression would never overflow. Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -4150,6 +4150,8 @@ static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
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rb->frames_per_block = req->tp_block_size / req->tp_frame_size;
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if (unlikely(rb->frames_per_block == 0))
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goto out;
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if (unlikely(req->tp_block_size > UINT_MAX / req->tp_block_nr))
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goto out;
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if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
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req->tp_frame_nr))
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goto out;
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