drm/nouveau: Validate channel indices passed from userspace.
When hacking the libdrm for improvements, I triggered a kernel crash related to the fact that the NOUVEAU_NOTIFIEROBJ_ALLOC ioctl calls nouveau_channel_get with an unchecked channel index. The patch ensures that the channel index is an unsigned and validates its value in nouveau_channel_get. Signed-off-by: Michel Hermier <hermier@frugalware.org> Signed-off-by: Francisco Jerez <currojerez@riseup.net> Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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@ -253,6 +253,9 @@ nouveau_channel_get(struct drm_device *dev, struct drm_file *file_priv, int id)
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struct nouveau_channel *chan;
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unsigned long flags;
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if (unlikely(id < 0 || id >= NOUVEAU_MAX_CHANNEL_NR))
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return ERR_PTR(-EINVAL);
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spin_lock_irqsave(&dev_priv->channels.lock, flags);
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chan = nouveau_channel_get_unlocked(dev_priv->channels.ptr[id]);
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spin_unlock_irqrestore(&dev_priv->channels.lock, flags);
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