printk: return -EINVAL if the message len is bigger than the buf size
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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@ -880,7 +880,9 @@ static int syslog_print(char __user *buf, int size)
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syslog_seq++;
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syslog_seq++;
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raw_spin_unlock_irq(&logbuf_lock);
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raw_spin_unlock_irq(&logbuf_lock);
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if (len > 0 && copy_to_user(buf, text, len))
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if (len > size)
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len = -EINVAL;
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else if (len > 0 && copy_to_user(buf, text, len))
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len = -EFAULT;
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len = -EFAULT;
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kfree(text);
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kfree(text);
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