[PATCH v2 3/7] base: soc: Check for NULL SoC device attributes

From: Geert Uytterhoeven
Date: Mon Oct 31 2016 - 07:31:45 EST


If soc_device_match() is used to check the value of a specific
attribute that is not present for the current SoC, the kernel crashes
with a NULL pointer dereference.

Fix this by explicitly checking for the absence of a needed property,
and considering this a non-match.

Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Acked-by: Arnd Bergmann <arnd@xxxxxxxx>
Acked-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
v2:
- Add Acked-by.
---
drivers/base/soc.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/base/soc.c b/drivers/base/soc.c
index 04ee597fc3a3fda0..dc26e5949a320223 100644
--- a/drivers/base/soc.c
+++ b/drivers/base/soc.c
@@ -176,19 +176,23 @@ static int soc_device_match_one(struct device *dev, void *arg)
const struct soc_device_attribute *match = arg;

if (match->machine &&
- !glob_match(match->machine, soc_dev->attr->machine))
+ (!soc_dev->attr->machine ||
+ !glob_match(match->machine, soc_dev->attr->machine)))
return 0;

if (match->family &&
- !glob_match(match->family, soc_dev->attr->family))
+ (!soc_dev->attr->family ||
+ !glob_match(match->family, soc_dev->attr->family)))
return 0;

if (match->revision &&
- !glob_match(match->revision, soc_dev->attr->revision))
+ (!soc_dev->attr->revision ||
+ !glob_match(match->revision, soc_dev->attr->revision)))
return 0;

if (match->soc_id &&
- !glob_match(match->soc_id, soc_dev->attr->soc_id))
+ (!soc_dev->attr->soc_id ||
+ !glob_match(match->soc_id, soc_dev->attr->soc_id)))
return 0;

return 1;
--
1.9.1