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authorLuiz Augusto von Dentz <luiz.von.dentz@intel.com>2022-08-01 13:52:07 -0700
committerLuiz Augusto von Dentz <luiz.von.dentz@intel.com>2022-08-08 17:03:40 -0700
commit332f1795ca202489c665a75e62e18ff6284de077 (patch)
tree51f688f124491bc1e27ba64b797a37a40e907285 /net
parent2e64fe4624d19bc71212aae434c54874e5c49c5a (diff)
Bluetooth: L2CAP: Fix l2cap_global_chan_by_psm regression
The patch d0be8347c623: "Bluetooth: L2CAP: Fix use-after-free caused by l2cap_chan_put" from Jul 21, 2022, leads to the following Smatch static checker warning: net/bluetooth/l2cap_core.c:1977 l2cap_global_chan_by_psm() error: we previously assumed 'c' could be null (see line 1996) Fixes: d0be8347c623 ("Bluetooth: L2CAP: Fix use-after-free caused by l2cap_chan_put") Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Diffstat (limited to 'net')
-rw-r--r--net/bluetooth/l2cap_core.c13
1 files changed, 6 insertions, 7 deletions
diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 77c0aac14539..cbe0cae73434 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -1970,11 +1970,11 @@ static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm,
bdaddr_t *dst,
u8 link_type)
{
- struct l2cap_chan *c, *c1 = NULL;
+ struct l2cap_chan *c, *tmp, *c1 = NULL;
read_lock(&chan_list_lock);
- list_for_each_entry(c, &chan_list, global_l) {
+ list_for_each_entry_safe(c, tmp, &chan_list, global_l) {
if (state && c->state != state)
continue;
@@ -1993,11 +1993,10 @@ static struct l2cap_chan *l2cap_global_chan_by_psm(int state, __le16 psm,
dst_match = !bacmp(&c->dst, dst);
if (src_match && dst_match) {
c = l2cap_chan_hold_unless_zero(c);
- if (!c)
- continue;
-
- read_unlock(&chan_list_lock);
- return c;
+ if (c) {
+ read_unlock(&chan_list_lock);
+ return c;
+ }
}
/* Closest match */