Messages in this thread Patch in this message | | | Date | Wed, 22 Feb 2006 00:03:46 +0100 | From | Karsten Keil <> | Subject | Re: [PATCH] ISDN: fix copy_to_user() unused result warning in isdn_ppp |
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On Tue, Feb 21, 2006 at 11:14:15PM +0100, Jesper Juhl wrote: > From: Jesper Juhl <jesper.juhl@gmail.com> > > > 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 <jesper.juhl@gmail.com> > > --- > > 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 <kkeil@suse.de>
-- Karsten Keil SuSE Labs ISDN development - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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