usbutils 0.91: Fix NULL pointer crash.

[YOCTO #2847]

Before use usbbuslist, we should check if it is valid.

(From OE-Core rev: fc6c6ce73105518f4106da469ed81d53d860a290)

Signed-off-by: Roy.Li <rongqing.li@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-bsp/usbutils/usbutils/Fix-NULL-pointer-crash.patch

@@ -0,0 +1,28 @@
+Fix NULL pointer crash.
+
+Before use usbbuslist, we should check if it is valid.
+
+Upstream-Status: Pending
+Signed-off-by: Roy.Li <rongqing.li@windriver.com>
+---
+ lsusb-t.c |    4 ++++
+ 1 files changed, 4 insertions(+), 0 deletions(-)
+
+diff --git a/lsusb-t.c b/lsusb-t.c
+index f604155..583a46a 100644
+--- a/lsusb-t.c
++++ b/lsusb-t.c
+@@ -643,6 +643,10 @@ static void sort_busses(void)
+ 	/* need to reverse sort bus numbers */
+ 	struct usbbusnode *t, *p, **pp;
+ 	int swapped;
++
++	if (!usbbuslist)
++		return;
++
+ 	do {
+ 		p = usbbuslist;
+ 		pp = &usbbuslist;
+-- 
+1.7.4.1
+

meta/recipes-bsp/usbutils/usbutils_0.91.bb

@@ -7,10 +7,11 @@ LICENSE = "GPLv2+"
 LIC_FILES_CHKSUM = "file://COPYING;md5=94d55d512a9ba36caa9b7df079bae19f"
 
 DEPENDS = "libusb zlib"
-PR = "r4"
+PR = "r5"
 
 SRC_URI = "${KERNELORG_MIRROR}/linux/utils/usb/usbutils/usbutils-${PV}.tar.gz \
-           file://usb-devices-avoid-dependency-on-bash.patch"
+           file://usb-devices-avoid-dependency-on-bash.patch \
+           file://Fix-NULL-pointer-crash.patch"
 
 SRC_URI[md5sum] = "49de2403b40bf3a9863faaa8d3858deb"
 SRC_URI[sha256sum] = "c122346b0225121bcf159abf804116f826a4a3462c94ce7b8871f7559e6b3a46"