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wrqu->encoding.length comes from the network administrator. It's size u16. We want to limit "tocopy" to the smallest value of either "len_keys", "wrqu->encoding.length" or 100. But because .length gets cast from u16 to u8 we might use a random, smaller value than the was desired. It's probably not very serious, but we may as well fix it. Btw, this is from code auditing and not from testing. I don't know if this affects anyone in real life. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>