This is a note to let you know that I've just added the patch titled
Bluetooth: L2CAP: Fix attempting to access uninitialized memory
to the 6.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
bluetooth-l2cap-fix-attempting-to-access-uninitialized-memory.patch
and it can be found in the queue-6.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b1a2cd50c0357f243b7435a732b4e62ba3157a2e Mon Sep 17 00:00:00 2001
From: Luiz Augusto von Dentz <luiz.von.dentz@xxxxxxxxx>
Date: Mon, 31 Oct 2022 16:10:52 -0700
Subject: Bluetooth: L2CAP: Fix attempting to access uninitialized memory
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
From: Luiz Augusto von Dentz <luiz.von.dentz@xxxxxxxxx>
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@xxxxxxxxxxxxxxx
Reported-by: Tamás Koczka <poprdi@xxxxxxxxxx>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@xxxxxxxxx>
Reviewed-by: Tedd Ho-Jeong An <tedd.an@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/bluetooth/l2cap_core.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -3764,7 +3764,8 @@ done:
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);
Patches currently in stable-queue which might be from luiz.von.dentz@xxxxxxxxx are
queue-6.0/bluetooth-l2cap-fix-accepting-connection-request-for-invalid-spsm.patch
queue-6.0/bluetooth-hci_conn-fix-cis-connection-dst_type-handl.patch
queue-6.0/bluetooth-l2cap-fix-attempting-to-access-uninitialized-memory.patch
queue-6.0/bluetooth-l2cap-fix-memory-leak-in-vhci_write.patch
queue-6.0/bluetooth-l2cap-fix-use-after-free-in-l2cap_conn_del.patch
queue-6.0/bluetooth-hci_conn-fix-not-restoring-iso-buffer-coun.patch
queue-6.0/bluetooth-l2cap-fix-use-after-free-caused-by-l2cap_r.patch
queue-6.0/bluetooth-virtio_bt-use-skb_put-to-set-length.patch
