acerhdf: driver didn't verify the pointers in which it got product information

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.

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>
Cc: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/platform/x86/acerhdf.c b/drivers/platform/x86/acerhdf.c
index 9226838c867f..6abd3f15dd85 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);