diff options
| author | Desmond Cheong Zhi Xi <desmondcheongzx@gmail.com> | 2021-09-03 05:13:05 +0200 |
|---|---|---|
| committer | Luiz Augusto von Dentz <luiz.von.dentz@intel.com> | 2021-09-04 01:33:10 +0200 |
| commit | f4712fa993f688d0a48e0c28728fcdeb88c1ea58 (patch) | |
| tree | 6f30a1ac4fa8340bf868fe7111dac0b876399087 | |
| parent | Bluetooth: btusb: Add support for IMC Networks Mediatek Chip(MT7921) (diff) | |
| download | linux-f4712fa993f688d0a48e0c28728fcdeb88c1ea58.tar.xz linux-f4712fa993f688d0a48e0c28728fcdeb88c1ea58.zip | |
Bluetooth: call sock_hold earlier in sco_conn_del
In sco_conn_del, conn->sk is read while holding on to the
sco_conn.lock to avoid races with a socket that could be released
concurrently.
However, in between unlocking sco_conn.lock and calling sock_hold,
it's possible for the socket to be freed, which would cause a
use-after-free write when sock_hold is finally called.
To fix this, the reference count of the socket should be increased
while the sco_conn.lock is still held.
Signed-off-by: Desmond Cheong Zhi Xi <desmondcheongzx@gmail.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
| -rw-r--r-- | net/bluetooth/sco.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c index b62c91c627e2..4a057f99b60a 100644 --- a/net/bluetooth/sco.c +++ b/net/bluetooth/sco.c @@ -187,10 +187,11 @@ static void sco_conn_del(struct hci_conn *hcon, int err) /* Kill socket */ sco_conn_lock(conn); sk = conn->sk; + if (sk) + sock_hold(sk); sco_conn_unlock(conn); if (sk) { - sock_hold(sk); lock_sock(sk); sco_sock_clear_timer(sk); sco_chan_del(sk, err); |