misc/mei: Add NULL check to component match callback functions

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Currently, component_match callback functions used in mei refers to the
driver name, assuming that the component device being matched has a
driver bound. It can cause a NULL pointer dereference when a device
without a driver bound registers a component. This is due to the nature
of the component framework where all registered components are matched
in any component_match callback functions. So even if a component is
registered by a totally irrelevant device, that component is also
shared to these callbacks for i915 driver.

To prevent totally irrelevant device being matched for i915 and causing
a NULL pointer dereference for checking driver name, add a NULL check on
dev->driver to check if there is a driver bound before checking the
driver name.

In the future, the string compare on the driver name, "i915" may need to
be refactored too.

Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Reviewed-by: Prashant Malani <pmalani@chromium.org>
Signed-off-by: Won Chung <wonchung@google.com>
Acked-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

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This commit is contained in:

Won Chung 2022-04-18 17:59:31 +00:00 • committed by Mika Westerberg

parent 9d2d0a5cf0

commit 84d4333c1e

2 changed files with 2 additions and 2 deletions

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2

drivers/misc/mei/hdcp/mei_hdcp.c

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2

drivers/misc/mei/pxp/mei_pxp.c

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