[PATCH 3/4] Driver didn't verify the pointers in which it got product information

[Peter Feuerer <peter@piie.net>]

[PATCH 3/4] Driver didn't verify the pointers in which it got product information
 back from DMI; on QEMU one of the pointers came back null,
 which made the driver crash and subsequently caused a kernel panic.

From: Rahul Chaturvedi <rkc@chromium.org>
Signed-off-by: Rahul Chaturvedi <rkc@chromium.org>
Signed-off-by: Peter Feuerer <peter@piie.net>
Cc: Borislav Petkov <petkovbb@gmail.com>
Cc: Andreas Mohr <andi@lisas.de>
Cc: Len Brown <lenb@kernel.org>

---
 drivers/platform/x86/acerhdf.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/platform/x86/acerhdf.c b/drivers/platform/x86/acerhdf.c
index 9226838..6abd3f1 100644
--- a/drivers/platform/x86/acerhdf.c
+++ b/drivers/platform/x86/acerhdf.c
@@ -524,6 +524,10 @@ static int acerhdf_check_hardware(void)
 	version = dmi_get_system_info(DMI_BIOS_VERSION);
 	product = dmi_get_system_info(DMI_PRODUCT_NAME);
 
+	if (!vendor || !version || !product) {
+		pr_err("error getting hardware information\n");
+		return -EINVAL;
+	}
 
 	pr_info("Acer Aspire One Fan driver, v.%s\n", DRV_VER);
 
-- 
1.7.1