The L2CAP_CONF_EFS and L2CAP_CONF_RFC messages can be sent from
userspace so their structure sizes need to be checked before parsing
them.
Based on a patch from Ran Menscher.
Reported-by: Ran Menscher <ran.mensc...@karambasecurity.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
net/bluetooth/l2cap_core.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 93daf94565cf..55e48e6efc2b 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -3361,7 +3361,8 @@ static int l2cap_parse_conf_req(struct l2cap_chan *chan,
void *data, size_t data
break;
case L2CAP_CONF_RFC:
- if (olen == sizeof(rfc))
+ if ((olen == sizeof(rfc)) &&
+ (endptr - ptr >= L2CAP_CONF_OPT_SIZE + sizeof(rfc)))
memcpy(&rfc, (void *) val, olen);
break;
@@ -3371,7 +3372,8 @@ static int l2cap_parse_conf_req(struct l2cap_chan *chan,
void *data, size_t data
break;
case L2CAP_CONF_EFS:
- if (olen == sizeof(efs)) {
+ if ((olen == sizeof(efs)) &&
+ (endptr - ptr >= L2CAP_CONF_OPT_SIZE +
sizeof(efs))) {
remote_efs = 1;
memcpy(&efs, (void *) val, olen);
}
@@ -3576,7 +3578,8 @@ static int l2cap_parse_conf_rsp(struct l2cap_chan *chan,
void *rsp, int len,
break;
case L2CAP_CONF_RFC:
- if (olen == sizeof(rfc))
+ if ((olen == sizeof(rfc)) &&
+ (endptr - ptr >= L2CAP_CONF_OPT_SIZE + sizeof(rfc)))
memcpy(&rfc, (void *)val, olen);
if (test_bit(CONF_STATE2_DEVICE, &chan->conf_state) &&
@@ -3596,7 +3599,8 @@ static int l2cap_parse_conf_rsp(struct l2cap_chan *chan,
void *rsp, int len,
break;
case L2CAP_CONF_EFS:
- if (olen == sizeof(efs)) {
+ if ((olen == sizeof(efs)) &&
+ (endptr - ptr >= L2CAP_CONF_OPT_SIZE +
sizeof(efs))) {
memcpy(&efs, (void *)val, olen);
if (chan->local_stype != L2CAP_SERV_NOTRAFIC &&
--
2.20.1
