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usb: typec: ucsi: displayport: Fix NULL pointer dereference

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commit d16e7b62c5adcd13832c6b0ba364c3468d21b856 upstream.

If the registration of the DisplayPort was not successful,
or if the port does not support DisplayPort alt mode in the
first place, the function ucsi_displayport_remove_partner()
will fail with NULL pointer dereference when it attempts to
access the driver data.

Adding a check to the function to make sure there really is
driver data for the device before modifying it.

Fixes: af8622f6a5 ("usb: typec: ucsi: Support for DisplayPort alt mode")
Reported-by: Andrea Gagliardi La Gala <andrea.lagala@gmail.com>
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=206365
Cc: stable@vger.kernel.org
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20200311130006.41288-2-heikki.krogerus@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Heikki Krogerus 2020-03-11 16:00:05 +03:00 • committed by Greg Kroah-Hartman
commit ff1d876e9f
1 changed files with 3 additions and 0 deletions
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3
drivers/usb/typec/ucsi/displayport.c
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@ -273,6 +273,9 @@ void ucsi_displayport_remove_partner(struct typec_altmode *alt)
return;
dp = typec_altmode_get_drvdata(alt);
if (!dp)
return;
dp->data.conf = 0;
dp->data.status = 0;
dp->initialized = false;