| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 22/43] net/packet: fix overflow in check for tp_reserve | Date | Mon, 1 May 2017 14:27:22 -0700 |
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4.4-stable review patch. If anyone has any objections, please let me know.
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From: Andrey Konovalov <andreyknvl@google.com>
[ Upstream commit bcc5364bdcfe131e6379363f089e7b4108d35b70 ]
When calculating po->tp_hdrlen + po->tp_reserve the result can overflow.
Fix by checking that tp_reserve <= INT_MAX on assign.
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> --- net/packet/af_packet.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -3626,6 +3626,8 @@ packet_setsockopt(struct socket *sock, i return -EBUSY; if (copy_from_user(&val, optval, sizeof(val))) return -EFAULT; + if (val > INT_MAX) + return -EINVAL; po->tp_reserve = val; return 0; }
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