net/tls: Only attach to sockets in ESTABLISHED state

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[ Upstream commit d91c3e17f7 ]

Calling accept on a TCP socket with a TLS ulp attached results
in two sockets that share the same ulp context.
The ulp context is freed while a socket is destroyed, so
after one of the sockets is released, the second second will
trigger a use after free when it tries to access the ulp context
attached to it.
We restrict the TLS ulp to sockets in ESTABLISHED state
to prevent the scenario above.

Fixes: 3c4d755915 ("tls: kernel TLS support")
Reported-by: syzbot+904e7cd6c5c741609228@syzkaller.appspotmail.com
Signed-off-by: Ilya Lesokhin <ilyal@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Ilya Lesokhin 2018-01-16 15:31:52 +02:00 • committed by Greg Kroah-Hartman

parent 48606bb1ee

commit a022bbe393

1 changed files with 9 additions and 0 deletions

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net/tls/tls_main.c

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