Commit d94c05e3 authored by Sarah Sharp's avatar Sarah Sharp Committed by Greg Kroah-Hartman

USB: xhci: Fix bug memory free after failed initialization.

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: default avatarSarah Sharp <sarah.a.sharp@linux.intel.com>
Cc: stable <stable@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 051522bb
......@@ -802,9 +802,11 @@ void xhci_mem_cleanup(struct xhci_hcd *xhci)
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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