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USB: legousbtower: fix memleak on disconnect 

If disconnect() races with release() after a process has been
interrupted, release() could end up returning early and the driver would
fail to free its driver data.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20191010125835.27031-3-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
alistair/sunxi64-5.4-dsi
Johan Hovold 2019-10-10 14:58:35 +02:00 committed by Greg Kroah-Hartman
parent b14a39048c
commit b6c03e5f7b
1 changed files with 1 additions and 4 deletions
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5
drivers/usb/misc/legousbtower.c
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@ -419,10 +419,7 @@ static int tower_release (struct inode *inode, struct file *file)
goto exit;
}
if (mutex_lock_interruptible(&dev->lock)) {
retval = -ERESTARTSYS;
goto exit;
}
mutex_lock(&dev->lock);
if (dev->open_count != 1) {
dev_dbg(&dev->udev->dev, "%s: device not opened exactly once\n",