Subject: Re: [PATCH 1/9] iwlegacy: Silence DEBUG_STRICT_USER_COPY_CHECKS=y warning

From: wwguy <[email-masked]>
Date: Thu, 12 May 2011 17:01:42 -0700

On Thu, 2011-05-12 at 16:50 -0700, Stephen Boyd wrote:
> Enabling DEBUG_STRICT_USER_COPY_CHECKS causes the following
> warning:
> 
> In file included from arch/x86/include/asm/uaccess.h:573,
>                  from include/net/checksum.h:25,
>                  from include/linux/skbuff.h:28,
>                  from drivers/net/wireless/iwlegacy/iwl-4965-rs.c:28:
> In function 'copy_from_user',
>     inlined from 'iwl4965_rs_sta_dbgfs_scale_table_write' at
>     drivers/net/wireless/iwlegacy/iwl-4965-rs.c:2616:
> arch/x86/include/asm/uaccess_64.h:65:
> warning: call to 'copy_from_user_overflow' declared with
> attribute warning: copy_from_user() buffer size is not provably
> correct
> 
> presumably due to buf_size being signed causing GCC to fail to
> see that buf_size can't become negative.
> 
> Cc: Johannes Berg <[email-masked]>
> Signed-off-by: Stephen Boyd <[email-masked]>
> ---
>  drivers/net/wireless/iwlegacy/iwl-4965-rs.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
Stanislaw Gruszka <[email-masked]> is the maintainer for iwlegacy

Thanks
Wey