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ping: prevent NULL pointer dereference on write to msg_name
A plain read() on a socket does set msg->msg_name to NULL. So check for NULL pointer first. Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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bug fix for CVE-2013-6432