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kmsg: /dev/kmsg - properly return possible copy_from_user() failure
author
Kay Sievers
<kay@vrfy.org>
Mon, 30 Jul 2012 21:40:08 +0000
(14:40 -0700)
committer
Linus Torvalds
<torvalds@linux-foundation.org>
Tue, 31 Jul 2012 00:25:13 +0000
(17:25 -0700)
Reported-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Kay Sievers <kay@vrfy.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
kernel/printk.c
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diff --git
a/kernel/printk.c
b/kernel/printk.c
index
50c96b5
..
852269a
100644
(file)
--- a/
kernel/printk.c
+++ b/
kernel/printk.c
@@
-389,8
+389,10
@@
static ssize_t devkmsg_writev(struct kiocb *iocb, const struct iovec *iv,
line = buf;
for (i = 0; i < count; i++) {
- if (copy_from_user(line, iv[i].iov_base, iv[i].iov_len))
+ if (copy_from_user(line, iv[i].iov_base, iv[i].iov_len)) {
+ ret = -EFAULT;
goto out;
+ }
line += iv[i].iov_len;
}