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Subject[ 09/52] usb: host: xhci: Fix Null pointer dereferencing with 71c731a for non-x86 systems
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3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Vivek Gautam <gautam.vivek@samsung.com>

commit 457a73d346187c2cc5d599072f38676f18f130e0 upstream.

In 71c731a: usb: host: xhci: Fix Compliance Mode on SN65LVPE502CP Hardware
when extracting DMI strings (vendor or product_name) to mark them as quirk
we may get NULL pointer in case of non-x86 systems which won't define
CONFIG_DMI. Hence susbsequent strstr() calls crash while driver probing.

So, returning 'false' here in case we get a NULL vendor or product_name.

This is tested with ARM (exynos) system.

This patch should be backported to stable kernels as old as 3.6, that
contain the commit 71c731a296f1b08a3724bd1b514b64f1bda87a23 "usb: host:
xhci: Fix Compliance Mode on SN65LVPE502CP Hardware"

Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Reported-by: Sebastian Gottschall (DD-WRT) <s.gottschall@dd-wrt.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/usb/host/xhci.c | 2 ++
1 file changed, 2 insertions(+)

--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -470,6 +470,8 @@ static bool compliance_mode_recovery_tim

dmi_product_name = dmi_get_system_info(DMI_PRODUCT_NAME);
dmi_sys_vendor = dmi_get_system_info(DMI_SYS_VENDOR);
+ if (!dmi_product_name || !dmi_sys_vendor)
+ return false;

if (!(strstr(dmi_sys_vendor, "Hewlett-Packard")))
return false;



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