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| author | Peter Hurley <peter@hurleysoftware.com> | 2014-02-09 20:59:18 -0500 |
|---|---|---|
| committer | Marcel Holtmann <marcel@holtmann.org> | 2014-02-14 13:39:31 -0800 |
| commit | 033ace99c444daa4141b84419f670513ce637b77 (patch) | |
| tree | 6640d710788117d3dbf9c76dd15e870dddbddec5 /net/bluetooth/rfcomm/tty.c | |
| parent | 7611fcedd6caae0586397508a2414788d87a231c (diff) | |
| download | linux-033ace99c444daa4141b84419f670513ce637b77.tar.bz2 | |
Bluetooth: Serialize RFCOMMCREATEDEV and RFCOMMRELEASEDEV ioctls
At least two different race conditions exist with multiple concurrent
RFCOMMCREATEDEV and RFCOMMRELEASEDEV ioctls:
* Multiple concurrent RFCOMMCREATEDEVs with RFCOMM_REUSE_DLC can
mistakenly share the same DLC.
* RFCOMMRELEASEDEV can destruct the rfcomm_dev still being
constructed by RFCOMMCREATEDEV.
Introduce rfcomm_ioctl_mutex to serialize these add/remove operations.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Tested-By: Alexander Holler <holler@ahsoftware.de>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'net/bluetooth/rfcomm/tty.c')
| -rw-r--r-- | net/bluetooth/rfcomm/tty.c | 27 |
1 files changed, 25 insertions, 2 deletions
diff --git a/net/bluetooth/rfcomm/tty.c b/net/bluetooth/rfcomm/tty.c index 4a38b5454ab0..ef2769553dab 100644 --- a/net/bluetooth/rfcomm/tty.c +++ b/net/bluetooth/rfcomm/tty.c @@ -40,6 +40,7 @@ #define RFCOMM_TTY_MAJOR 216 /* device node major id of the usb/bluetooth.c driver */ #define RFCOMM_TTY_MINOR 0 +static DEFINE_MUTEX(rfcomm_ioctl_mutex); static struct tty_driver *rfcomm_tty_driver; struct rfcomm_dev { @@ -373,7 +374,7 @@ static struct sk_buff *rfcomm_wmalloc(struct rfcomm_dev *dev, unsigned long size #define NOCAP_FLAGS ((1 << RFCOMM_REUSE_DLC) | (1 << RFCOMM_RELEASE_ONHUP)) -static int rfcomm_create_dev(struct sock *sk, void __user *arg) +static int __rfcomm_create_dev(struct sock *sk, void __user *arg) { struct rfcomm_dev_req req; struct rfcomm_dlc *dlc; @@ -423,7 +424,7 @@ static int rfcomm_create_dev(struct sock *sk, void __user *arg) return id; } -static int rfcomm_release_dev(void __user *arg) +static int __rfcomm_release_dev(void __user *arg) { struct rfcomm_dev_req req; struct rfcomm_dev *dev; @@ -466,6 +467,28 @@ static int rfcomm_release_dev(void __user *arg) return 0; } +static int rfcomm_create_dev(struct sock *sk, void __user *arg) +{ + int ret; + + mutex_lock(&rfcomm_ioctl_mutex); + ret = __rfcomm_create_dev(sk, arg); + mutex_unlock(&rfcomm_ioctl_mutex); + + return ret; +} + +static int rfcomm_release_dev(void __user *arg) +{ + int ret; + + mutex_lock(&rfcomm_ioctl_mutex); + ret = __rfcomm_release_dev(arg); + mutex_unlock(&rfcomm_ioctl_mutex); + + return ret; +} + static int rfcomm_get_dev_list(void __user *arg) { struct rfcomm_dev *dev; |