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Bluetooth: L2CAP: Fix attempting to access uninitialized memory

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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>
This commit is contained in:
Luiz Augusto von Dentz 2022-10-31 16:10:52 -07:00
parent f937b758a1
commit b1a2cd50c0
1 changed files with 2 additions and 1 deletions
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3
net/bluetooth/l2cap_core.c
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@ -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);