diff options
author | Sarah Sharp <sarah.a.sharp@linux.intel.com> | 2009-11-04 01:02:22 -0500 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-11-17 19:46:34 -0500 |
commit | d94c05e33d9212ee67b8d4998f984cc71df8168b (patch) | |
tree | 9973d10bb0e1730af6145655fec4cde3a79a54c2 /drivers/usb | |
parent | 051522bb47797f7168a617a0752d7ddc1a2f6f24 (diff) |
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: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb')
-rw-r--r-- | drivers/usb/host/xhci-mem.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c index 1db4fea8c170..732580c6cbea 100644 --- a/drivers/usb/host/xhci-mem.c +++ b/drivers/usb/host/xhci-mem.c | |||
@@ -802,9 +802,11 @@ void xhci_mem_cleanup(struct xhci_hcd *xhci) | |||
802 | int i; | 802 | int i; |
803 | 803 | ||
804 | /* Free the Event Ring Segment Table and the actual Event Ring */ | 804 | /* Free the Event Ring Segment Table and the actual Event Ring */ |
805 | xhci_writel(xhci, 0, &xhci->ir_set->erst_size); | 805 | if (xhci->ir_set) { |
806 | xhci_write_64(xhci, 0, &xhci->ir_set->erst_base); | 806 | xhci_writel(xhci, 0, &xhci->ir_set->erst_size); |
807 | xhci_write_64(xhci, 0, &xhci->ir_set->erst_dequeue); | 807 | xhci_write_64(xhci, 0, &xhci->ir_set->erst_base); |
808 | xhci_write_64(xhci, 0, &xhci->ir_set->erst_dequeue); | ||
809 | } | ||
808 | size = sizeof(struct xhci_erst_entry)*(xhci->erst.num_entries); | 810 | size = sizeof(struct xhci_erst_entry)*(xhci->erst.num_entries); |
809 | if (xhci->erst.entries) | 811 | if (xhci->erst.entries) |
810 | pci_free_consistent(pdev, size, | 812 | pci_free_consistent(pdev, size, |