From: Michael Brown <mcb30@ipxe.org>
Date: Thu, 10 Sep 2015 23:19:16 +0000 (+0100)
Subject: [ehci] Do not treat zero-length NULL pointers as unreachable
X-Git-Tag: v1.20.1~697
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6424a383231d622245514ce9d4f716a6aa607ac0;p=thirdparty%2Fipxe.git

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

Signed-off-by: Michael Brown <mcb30@ipxe.org>
---

diff --git a/src/drivers/usb/ehci.c b/src/drivers/usb/ehci.c
index 0a89ec133..c2de53a47 100644
--- a/src/drivers/usb/ehci.c
+++ b/src/drivers/usb/ehci.c
@@ -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;