From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com> stable inclusion from stable-v5.10.154 commit 26ca2ac091b49281d73df86111d16e5a76e43bd7 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I5ZNRS CVE: CVE-2022-42895 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- 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> Signed-off-by: Baisong Zhong <zhongbaisong@huawei.com> Reviewed-by: Liu Jian <liujian56@huawei.com> Reviewed-by: Yue Haibing <yuehaibing@huawei.com> Reviewed-by: Wang Weiyang <wangweiyang2@huawei.com> Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com> --- net/bluetooth/l2cap_core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c index 584a9deb8c80..d35b168e7793 100644 --- a/net/bluetooth/l2cap_core.c +++ b/net/bluetooth/l2cap_core.c @@ -3758,7 +3758,8 @@ 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); -- 2.20.1