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| author |   Dan Carpenter <dan.carpenter@oracle.com> | 2022-01-07 10:16:44 +0300 |
|---|---|---|
| committer |   Marcel Holtmann <marcel@holtmann.org> | 2022-01-07 08:40:11 +0100 |
| commit | 2b70d4f9b20635ac328836e50d183632e1930f94 (patch) | |
| tree | a4fb8ca59cf7e5f1222bf11ba58f667c16a32c46 | |
| parent | Bluetooth: btqca: sequential validation (diff) | |
| download | linux-dev-2b70d4f9b20635ac328836e50d183632e1930f94.tar.xz linux-dev-2b70d4f9b20635ac328836e50d183632e1930f94.zip | |
Bluetooth: L2CAP: uninitialized variables in l2cap_sock_setsockopt()
The "opt" variable is a u32, but on some paths only the top bytes
were initialized and the others contained random stack data.
Fixes: a7b75c5a8c41 ("net: pass a sockptr_t into ->setsockopt")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
| -rw-r--r-- | net/bluetooth/l2cap_sock.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c index 188e4d4813b0..ca8f07f3542b 100644 --- a/net/bluetooth/l2cap_sock.c +++ b/net/bluetooth/l2cap_sock.c @@ -904,6 +904,8 @@ static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, struct l2cap_conn *conn; int len, err = 0; u32 opt; + u16 mtu; + u8 mode; BT_DBG("sk %p", sk); @@ -1086,16 +1088,16 @@ static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, break; } - if (copy_from_sockptr(&opt, optval, sizeof(u16))) { + if (copy_from_sockptr(&mtu, optval, sizeof(u16))) { err = -EFAULT; break; } if (chan->mode == L2CAP_MODE_EXT_FLOWCTL && sk->sk_state == BT_CONNECTED) - err = l2cap_chan_reconfigure(chan, opt); + err = l2cap_chan_reconfigure(chan, mtu); else - chan->imtu = opt; + chan->imtu = mtu; break; @@ -1117,14 +1119,14 @@ static int l2cap_sock_setsockopt(struct socket *sock, int level, int optname, break; } - if (copy_from_sockptr(&opt, optval, sizeof(u8))) { + if (copy_from_sockptr(&mode, optval, sizeof(u8))) { err = -EFAULT; break; } - BT_DBG("opt %u", opt); + BT_DBG("mode %u", mode); - err = l2cap_set_mode(chan, opt); + err = l2cap_set_mode(chan, mode); if (err) break; |