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[ehci] Do not treat zero-length NULL pointers as unreachable

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Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2015-09-11 00:19:16 +01:00
parent f9e192605c
commit 6424a38323
1 changed files with 2 additions and 0 deletions
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2
src/drivers/usb/ehci.c
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@ -603,6 +603,8 @@ static int ehci_enqueue ( struct ehci_device *ehci, struct ehci_ring *ring,
/* Fail if any portion is unreachable */
for ( i = 0 ; i < count ; i++ ) {
if ( ! xfer[i].len )
continue;
phys = ( virt_to_phys ( xfer[i].data ) + xfer[i].len - 1 );
if ( ( phys > 0xffffffffUL ) && ( ! ehci->addr64 ) )
return -ENOTSUP;