On Thu, Oct 27, 2016 at 03:57:41PM +0200, Arnd Bergmann wrote:
> With gcc-5 or higher on x86, we can get a bogus warning in the
> dvb-net code:
>
> drivers/media/dvb-core/dvb_net.c: In function ‘dvb_net_ule’:
> arch/x86/include/asm/string_32.h:77:14: error: ‘dest_addr’ may be used
> uninitialized in this function [-Werror=maybe-uninitialized]
> drivers/media/dvb-core/dvb_net.c:633:8: note: ‘dest_addr’ was declared here
>
> The problem here is that gcc doesn't track all of the conditions
> to prove it can't end up copying uninitialized data.
> This changes the logic around so we zero out the destination
> address earlier when we determine that it is not set here.
> This allows the compiler to figure it out.
>
> Signed-off-by: Arnd Bergmann <a...@arndb.de>
> ---
> drivers/media/dvb-core/dvb_net.c | 12 +++++-------
> 1 file changed, 5 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/media/dvb-core/dvb_net.c
> b/drivers/media/dvb-core/dvb_net.c
> index 088914c4623f..f1b416de9dab 100644
> --- a/drivers/media/dvb-core/dvb_net.c
> +++ b/drivers/media/dvb-core/dvb_net.c
> @@ -688,6 +688,9 @@ static void dvb_net_ule( struct net_device *dev, const u8
> *buf, size_t buf_len )
> ETH_ALEN);
> skb_pull(priv->ule_skb,
> ETH_ALEN);
> }
> + } else {
> + /* othersie use zero destination
> address */
I'm assuming you meant "otherwise" there instead of "othersie".
--
Jarod Wilson
ja...@redhat.com
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