Commit 36919a82 authored Oct 31, 2022 by Luiz Augusto von Dentz Committed by Greg Kroah-Hartman Nov 10, 2022

Bluetooth: L2CAP: Fix attempting to access uninitialized memory



commit b1a2cd50c0357f243b7435a732b4e62ba3157a2e upstream.

On l2cap_parse_conf_req the variable efs is only initialized if
remote_efs has been set.

CVE: CVE-2022-42895
CC: stable@vger.kernel.org
Reported-by: Tamás Koczka <poprdi@google.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Reviewed-by: Tedd Ho-Jeong An <tedd.an@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 8c6ae926

net/bluetooth/l2cap_core.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -3551,7 +3551,8 @@ static int l2cap_parse_conf_req(struct l2cap_chan chan, void data, size_t data
		l2cap_add_conf_opt(&ptr, L2CAP_CONF_RFC,
		sizeof(rfc), (unsigned long) &rfc, endptr - ptr);

		if (test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
		if (remote_efs &&
		test_bit(FLAG_EFS_ENABLE, &chan->flags)) {
		chan->remote_id = efs.id;
		chan->remote_stype = efs.stype;
		chan->remote_msdu = le16_to_cpu(efs.msdu);