Tom Herbert e557124023 kcm: Check if sk_user_data already set in kcm_attach ... This is needed to prevent sk_user_data being overwritten. The check is done under the callback lock. This should prevent a socket from being attached twice to a KCM mux. It also prevents a socket from being attached for other use cases of sk_user_data as long as the other cases set sk_user_data under the lock. Followup work is needed to unify all the use cases of sk_user_data to use the same locking. Reported-by: syzbot+114b15f2be420a8886c3@syzkaller.appspotmail.com Fixes: ab7ac4eb98 ("kcm: Kernel Connection Multiplexor module") Signed-off-by: Tom Herbert <tom@quantonium.net> Reviewed-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2018-01-24 15:54:30 -05:00
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kcmproc.c
kcmsock.c	kcm: Check if sk_user_data already set in kcm_attach	2018-01-24 15:54:30 -05:00
Kconfig
Makefile