Bluetooth: Fix using uninitialized option in RFCMode

If remote device sends bogus RFC option with invalid length,
undefined options values are used. Fix this by using defaults when
remote misbehaves.

This also fixes the following warning reported by gcc 4.7.0:

net/bluetooth/l2cap_core.c: In function 'l2cap_config_rsp':
net/bluetooth/l2cap_core.c:3302:13: warning: 'rfc.max_pdu_size' may be used uninitialized in this function [-Wmaybe-uninitialized]
net/bluetooth/l2cap_core.c:3266:24: note: 'rfc.max_pdu_size' was declared here
net/bluetooth/l2cap_core.c:3298:25: warning: 'rfc.monitor_timeout' may be used uninitialized in this function [-Wmaybe-uninitialized]
net/bluetooth/l2cap_core.c:3266:24: note: 'rfc.monitor_timeout' was declared here
net/bluetooth/l2cap_core.c:3297:25: warning: 'rfc.retrans_timeout' may be used uninitialized in this function [-Wmaybe-uninitialized]
net/bluetooth/l2cap_core.c:3266:24: note: 'rfc.retrans_timeout' was declared here
net/bluetooth/l2cap_core.c:3295:2: warning: 'rfc.mode' may be used uninitialized in this function [-Wmaybe-uninitialized]
net/bluetooth/l2cap_core.c:3266:24: note: 'rfc.mode' was declared here

Signed-off-by: Szymon Janc <szymon.janc@tieto.com>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 8394e3615ef6f42c6e8ec2022c3bc5fda7964000..4554e80d16a37b8ffdc0a7ac86805da2f2ee06e9 100644 (file)
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -2915,12 +2915,14 @@ static void l2cap_conf_rfc_get(struct l2cap_chan *chan, void *rsp, int len)
        while (len >= L2CAP_CONF_OPT_SIZE) {
                len -= l2cap_get_conf_opt(&rsp, &type, &olen, &val);
 
-               switch (type) {
-               case L2CAP_CONF_RFC:
-                       if (olen == sizeof(rfc))
-                               memcpy(&rfc, (void *)val, olen);
-                       goto done;
-               }
+               if (type != L2CAP_CONF_RFC)
+                       continue;
+
+               if (olen != sizeof(rfc))
+                       break;
+
+               memcpy(&rfc, (void *)val, olen);
+               goto done;
        }
 
        /* Use sane default values in case a misbehaving remote device