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base: soc: Check for NULL SoC device attributes

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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@glider.be>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Geert Uytterhoeven 2016-10-03 17:43:41 +02:00
parent c97db7cc77
commit ab6a713e7d
1 changed files with 8 additions and 4 deletions
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12
drivers/base/soc.c
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@ -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;