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[Hardy,CVE-2010-4242,1/1] bluetooth: Fix missing NULL check, CVE-2010-4242

Message ID 1297456520-4811-3-git-send-email-brad.figg@canonical.com
State Accepted
Commit d4d1572d0fb2d485f205a180ab866cc0416a1e2f
Headers show

Commit Message

Brad Figg Feb. 11, 2011, 8:35 p.m. UTC 
From: Alan Cox <alan@linux.intel.com>

CVE-2010-4242

BugLink: http://bugs.launchpad.net/bugs/714846

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>

(backported from commit c19483cc5e56ac5e22dd19cf25ba210ab1537773)
Signed-off-by: Brad Figg <brad.figg@canonical.com>
---
 drivers/bluetooth/hci_ldisc.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
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Patch

diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c
index 998833d..17361ba 100644
--- a/drivers/bluetooth/hci_ldisc.c
+++ b/drivers/bluetooth/hci_ldisc.c
@@ -256,9 +256,16 @@  static int hci_uart_tty_open(struct tty_struct *tty)
 
 	BT_DBG("tty %p", tty);
 
+	/* FIXME: This btw is bogus, nothing requires the old ldisc to clear
+	   the pointer */
 	if (hu)
 		return -EEXIST;
 
+	/* Error if the tty has no write op instead of leaving an exploitable
+	   hole */
+	if (tty->driver->write == NULL)
+		return -EOPNOTSUPP;
+
 	if (!(hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL))) {
 		BT_ERR("Can't allocate control structure");
 		return -ENFILE;