cdc-acm: add sanity checks
commit 7e860a6e upstream. Check the special CDC headers for a plausible minimum length. Another big operating systems ignores such garbage. Signed-off-by: Oliver Neukum <oneukum@suse.de> Reviewed-by: Adam Lee <adam8157@gmail.com> Tested-by: Adam Lee <adam8157@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
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