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/freebsd-11-stable/sys/sys/
H A Dsocketvar.hdiff 117708 Thu Jul 17 21:49:10 MDT 2003 robert To avoid a kernel panic provoked by a NULL pointer dereference,
do not clear the `sb_sel' member of the sockbuf structure
while invalidating the receive sockbuf in sorflush(), called
from soshutdown().

The panic was reproduceable from user land by attaching a knote
with EVFILT_READ filters to a socket, disabling further reads
from it using shutdown(2), and then closing it. knote_remove()
was called to remove all knotes from the socket file descriptor
by detaching each using its associated filterops' detach call-
back function, sordetach() in this case, which tried to remove
itself from the invalidated sockbuf's klist (sb_sel.si_note).

PR: kern/54331
/freebsd-11-stable/sys/kern/
H A Duipc_socket.cdiff 117708 Thu Jul 17 21:49:10 MDT 2003 robert To avoid a kernel panic provoked by a NULL pointer dereference,
do not clear the `sb_sel' member of the sockbuf structure
while invalidating the receive sockbuf in sorflush(), called
from soshutdown().

The panic was reproduceable from user land by attaching a knote
with EVFILT_READ filters to a socket, disabling further reads
from it using shutdown(2), and then closing it. knote_remove()
was called to remove all knotes from the socket file descriptor
by detaching each using its associated filterops' detach call-
back function, sordetach() in this case, which tried to remove
itself from the invalidated sockbuf's klist (sb_sel.si_note).

PR: kern/54331

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