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printk: return -EINVAL if the message len is bigger than the buf size

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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 <[email protected]>
Acked-by: Fengguang Wu <[email protected]>
Signed-off-by: Yuanhan Liu <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Yuanhan Liu 2012-06-16 12:40:55 +08:00 • committed by Greg Kroah-Hartman
commit b56a39ac26
1 changed files with 3 additions and 1 deletions
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4
kernel/printk.c
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@ -880,7 +880,9 @@ static int syslog_print(char __user *buf, int size)
syslog_seq++;
raw_spin_unlock_irq(&logbuf_lock);
if (len > 0 && copy_to_user(buf, text, len))
if (len > size)
len = -EINVAL;
else if (len > 0 && copy_to_user(buf, text, len))
len = -EFAULT;
kfree(text);