| Date | Sun, 06 Dec 2009 16:00:21 -0800 | From | Greg KH <> | Subject | [045/119] USB: xhci: Fix bug memory free after failed initialization. |
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2.6.31-stable review patch. If anyone has any objections, please let us know.
------------------ From: Sarah Sharp <sarah.a.sharp@linux.intel.com>
commit d94c05e33d9212ee67b8d4998f984cc71df8168b upstream.
If the xHCI driver fails during the memory initialization, xhci->ir_set may not be a valid pointer. Check that it points to valid DMA'able memory before writing to that address during the memory freeing process.
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- drivers/usb/host/xhci-mem.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)
--- a/drivers/usb/host/xhci-mem.c +++ b/drivers/usb/host/xhci-mem.c @@ -756,9 +756,11 @@ void xhci_mem_cleanup(struct xhci_hcd *x int i; /* Free the Event Ring Segment Table and the actual Event Ring */ - xhci_writel(xhci, 0, &xhci->ir_set->erst_size); - xhci_write_64(xhci, 0, &xhci->ir_set->erst_base); - xhci_write_64(xhci, 0, &xhci->ir_set->erst_dequeue); + if (xhci->ir_set) { + xhci_writel(xhci, 0, &xhci->ir_set->erst_size); + xhci_write_64(xhci, 0, &xhci->ir_set->erst_base); + xhci_write_64(xhci, 0, &xhci->ir_set->erst_dequeue); + } size = sizeof(struct xhci_erst_entry)*(xhci->erst.num_entries); if (xhci->erst.entries) pci_free_consistent(pdev, size,
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