HID: logitech: perform bounds checking on device_id early enough

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commit ad3e14d7c5 upstream.

device_index is a char type and the size of paired_dj_deivces is 7
elements, therefore proper bounds checking has to be applied to
device_index before it is used.

We are currently performing the bounds checking in
logi_dj_recv_add_djhid_device(), which is too late, as malicious device
could send REPORT_TYPE_NOTIF_DEVICE_UNPAIRED early enough and trigger the
problem in one of the report forwarding functions called from
logi_dj_raw_event().

Fix this by performing the check at the earliest possible ocasion in
logi_dj_raw_event().

Reported-by: Ben Hawkes <hawkes@google.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Jiri Kosina 2014-08-21 09:57:17 -05:00 • committed by Greg Kroah-Hartman

parent b8c0d10f1f

commit e98c81884f

1 changed files with 6 additions and 7 deletions

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drivers/hid/hid-logitech-dj.c

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