[PATCH] net: Initialize all members in skb_gro_remcsum_init()

[PATCH] net: Initialize all members in skb_gro_remcsum_init()

[Geert Uytterhoeven]

skb_gro_remcsum_init() initializes the gro_remcsum.delta member only,
leading to compiler warnings about a possibly uninitialized
gro_remcsum.offset member:

drivers/net/vxlan.c: In function ‘vxlan_gro_receive’:
drivers/net/vxlan.c:602: warning: ‘grc.offset’ may be used uninitialized in this function
net/ipv4/fou.c: In function ‘gue_gro_receive’:
net/ipv4/fou.c:262: warning: ‘grc.offset’ may be used uninitialized in this function

While these are harmless for now:
  - skb_gro_remcsum_process() sets offset before changing delta,
  - skb_gro_remcsum_cleanup() checks if delta is non-zero before
    accessing offset,
it's safer to let the initialization function initialize all members.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
---
 include/linux/netdevice.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 5897b4ea5a3f9e0f..429d1790a27e85f3 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -2342,6 +2342,7 @@ struct gro_remcsum {
 
 static inline void skb_gro_remcsum_init(struct gro_remcsum *grc)
 {
+	grc->offset = 0;
 	grc->delta = 0;
 }
 
-- 
1.9.1

Re: [PATCH] net: Initialize all members in skb_gro_remcsum_init()

[Tom Herbert]

On Wed, Feb 18, 2015 at 2:38 AM, Geert Uytterhoeven
<geert@linux-m68k.org> wrote:
> skb_gro_remcsum_init() initializes the gro_remcsum.delta member only,
> leading to compiler warnings about a possibly uninitialized
> gro_remcsum.offset member:
>
> drivers/net/vxlan.c: In function ‘vxlan_gro_receive’:
> drivers/net/vxlan.c:602: warning: ‘grc.offset’ may be used uninitialized in this function
> net/ipv4/fou.c: In function ‘gue_gro_receive’:
> net/ipv4/fou.c:262: warning: ‘grc.offset’ may be used uninitialized in this function
>
> While these are harmless for now:
>   - skb_gro_remcsum_process() sets offset before changing delta,
>   - skb_gro_remcsum_cleanup() checks if delta is non-zero before
>     accessing offset,
> it's safer to let the initialization function initialize all members.
>

Acked-by: Tom Herbert <therbert@google.com>

> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
> ---
>  include/linux/netdevice.h | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> index 5897b4ea5a3f9e0f..429d1790a27e85f3 100644
> --- a/include/linux/netdevice.h
> +++ b/include/linux/netdevice.h
> @@ -2342,6 +2342,7 @@ struct gro_remcsum {
>
>  static inline void skb_gro_remcsum_init(struct gro_remcsum *grc)
>  {
> +       grc->offset = 0;
>         grc->delta = 0;
>  }
>
> --
> 1.9.1
>

Re: [PATCH] net: Initialize all members in skb_gro_remcsum_init()

[David Miller]

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: Text/Plain; charset=iso-8859-7, Size: 1049 bytes --]

From: Geert Uytterhoeven <geert@linux-m68k.org>
Date: Wed, 18 Feb 2015 11:38:06 +0100

> skb_gro_remcsum_init() initializes the gro_remcsum.delta member only,
> leading to compiler warnings about a possibly uninitialized
> gro_remcsum.offset member:
> 
> drivers/net/vxlan.c: In function ¡vxlan_gro_receive¢:
> drivers/net/vxlan.c:602: warning: ¡grc.offset¢ may be used uninitialized in this function
> net/ipv4/fou.c: In function ¡gue_gro_receive¢:
> net/ipv4/fou.c:262: warning: ¡grc.offset¢ may be used uninitialized in this function
> 
> While these are harmless for now:
>   - skb_gro_remcsum_process() sets offset before changing delta,
>   - skb_gro_remcsum_cleanup() checks if delta is non-zero before
>     accessing offset,
> it's safer to let the initialization function initialize all members.
> 
> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

Applied, thank you.
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