bluetooth: Fix missing NULL check
Fortunately this is only exploitable on very unusual hardware. [Reported a while ago but nothing happened so just fixing it] Signed-off-by: Alan Cox <alan@linux.intel.com> Cc: stable@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -256,9 +256,16 @@ static int hci_uart_tty_open(struct tty_struct *tty)
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BT_DBG("tty %p", tty);
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/* FIXME: This btw is bogus, nothing requires the old ldisc to clear
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the pointer */
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if (hu)
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return -EEXIST;
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/* Error if the tty has no write op instead of leaving an exploitable
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hole */
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if (tty->ops->write == NULL)
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return -EOPNOTSUPP;
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if (!(hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL))) {
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BT_ERR("Can't allocate control structure");
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return -ENFILE;
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