a85b7f125b
When using the SOL_SOCKET level socket option SO_LINGER, the structure struct linger is used as the option value. The component l_linger is of type int, but internally copied to the field so_linger of the structure struct socket. The type of so_linger is short, but it is assumed to be non-negative and the value is used to compute ticks to be stored in a variable of type int. Therefore, perform input validation on l_linger similar to the one performed by NetBSD and OpenBSD. Thanks to syzkaller for making me aware of this issue. Thanks to markj@ for pointing out that a similar check should be added to so_linger_set(). Reviewed by: markj@ MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D20948
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