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xhci: fix null pointer dereference on ring_doorbell_for_active_rings
in some cases where device is attched to xhci port and do not responding,
for example ath9k_htc with stalled firmware, kernel will
crash on ring_doorbell_for_active_rings.
This patch check if pointer exist before it is used.
This patch should be backported to kernels as old as 2.6.35, that
contain the commit e9df17eb14
"USB: xhci:
Correct assumptions about number of rings per endpoint"
Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Cc: stable@vger.kernel.org
This commit is contained in:
parent
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commit
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1 changed files with 1 additions and 1 deletions
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@ -434,7 +434,7 @@ static void ring_doorbell_for_active_rings(struct xhci_hcd *xhci,
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/* A ring has pending URBs if its TD list is not empty */
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if (!(ep->ep_state & EP_HAS_STREAMS)) {
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if (!(list_empty(&ep->ring->td_list)))
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if (ep->ring && !(list_empty(&ep->ring->td_list)))
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xhci_ring_ep_doorbell(xhci, slot_id, ep_index, 0);
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return;
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}
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