3.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Szymon Janc <szymon.j...@tieto.com>
commit 8f321f853ea33330c7141977cd34804476e2e07e upstream.
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.j...@tieto.com>
Signed-off-by: Gustavo Padovan <gustavo.pado...@collabora.co.uk>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
net/bluetooth/l2cap_core.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -2585,12 +2585,14 @@ static void l2cap_conf_rfc_get(struct l2
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
--
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