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printk: return -EINVAL if the message len is bigger than the buf size
authorYuanhan Liu <yuanhan.liu@linux.intel.com>
Sat, 16 Jun 2012 04:40:55 +0000 (12:40 +0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sat, 16 Jun 2012 15:36:03 +0000 (08:36 -0700)
Just like what devkmsg_read() does, return -EINVAL if the message len is
bigger than the buf size, or it will trigger a segfault error.

Acked-by: Kay Sievers <kay@vrfy.org>
Acked-by: Fengguang Wu <wfg@linux.intel.com>
Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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