Linux NULL pointer dereference due to incorrect proto_ops initializations

“The issue lies in how Linux deals with unavailable operations
for some protocols. sock_sendpage and others don’t check for NULL
pointers before dereferencing operations in the ops structure.
Instead the kernel relies on correct initialization of those
proto_ops structures with stubs (such as sock_no_sendpage) instead
of NULL pointers.”

A patch has been committed— ed.

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