UPSTREAM: net: validate the range we feed to iov_iter_init() in sys_sendto/sys_recvfrom
(cherry pick from commit 4de930ef) Cc: stable@vger.kernel.org # v3.19 Signed-off-by:Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by:
David S. Miller <davem@davemloft.net> Bug: 28759139 Change-Id: I561a14b514d714838ef539a94275b117d7f475f4
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