On Tue, Feb 21, 2006 at 11:14:15PM +0100, Jesper Juhl wrote:
> From: Jesper Juhl <[email protected]>
>
>
> Fix compile warning about copy_to_user() unused result in isdn_ppp.c
> drivers/isdn/i4l/isdn_ppp.c:785: warning: ignoring return value of `copy_to_user', declared with attribute warn_unused_result
>
>
> Signed-off-by: Jesper Juhl <[email protected]>
>
> ---
>
> drivers/isdn/i4l/isdn_ppp.c | 5 ++++-
> 1 files changed, 4 insertions(+), 1 deletion(-)
>
> --- linux-2.6.16-rc4-mm1-orig/drivers/isdn/i4l/isdn_ppp.c 2006-01-03 04:21:10.000000000 +0100
> +++ linux-2.6.16-rc4-mm1/drivers/isdn/i4l/isdn_ppp.c 2006-02-21 23:07:57.000000000 +0100
> @@ -782,7 +782,10 @@ isdn_ppp_read(int min, struct file *file
> is->first = b;
>
> spin_unlock_irqrestore(&is->buflock, flags);
> - copy_to_user(buf, save_buf, count);
> + if (copy_to_user(buf, save_buf, count)) {
> + kfree(save_buf);
> + return -EFAULT;
> + }
> kfree(save_buf);
>
> return count;
What about:
--- linux-2.6.16-rc4-mm1-orig/drivers/isdn/i4l/isdn_ppp.c 2006-01-03 04:21:10.000000000 +0100
+++ linux-2.6.16-rc4-mm1/drivers/isdn/i4l/isdn_ppp.c 2006-02-21 23:07:57.000000000 +0100
@@ -782,7 +782,8 @@ isdn_ppp_read(int min, struct file *file
is->first = b;
spin_unlock_irqrestore(&is->buflock, flags);
- copy_to_user(buf, save_buf, count);
+ if (copy_to_user(buf, save_buf, count))
+ count = -EFAULT;
kfree(save_buf);
return count;
should result in a conditional move instead of jumps.
But I'm OK with the original patch as well, for both version you can add
Signed-off-by: Karsten Keil <[email protected]>
--
Karsten Keil
SuSE Labs
ISDN development
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