[PATCH] net/core/skbuff.c fix skb_expand_head off logic error!

[PATCH] net/core/skbuff.c fix skb_expand_head off logic error!

[web_czom]

fix logic error!

--- linux/net/core/skbuff.c.orig	2018-04-23 20:55:37.747731000 +0800
+++ linux/net/core/skbuff.c	2018-04-23 20:56:30.782520000 +0800
@@ -1492,7 +1492,7 @@ int pskb_expand_head(struct sk_buff *skb
 	} else {
 		skb_free_head(skb);
 	}
-	off = (data + nhead) - skb->head;
+	off = (skb->data - skb->head) + nhead;
 
 	skb->head     = data;
 	skb->head_frag = 0;

Re: [PATCH] net/core/skbuff.c fix skb_expand_head off logic error!

[Greg KH]

On Mon, Apr 23, 2018 at 09:02:46PM +0800, web_czom@yeah.net wrote:
> fix logic error!
> 
> --- linux/net/core/skbuff.c.orig	2018-04-23 20:55:37.747731000 +0800
> +++ linux/net/core/skbuff.c	2018-04-23 20:56:30.782520000 +0800
> @@ -1492,7 +1492,7 @@ int pskb_expand_head(struct sk_buff *skb
>  	} else {
>  		skb_free_head(skb);
>  	}
> -	off = (data + nhead) - skb->head;
> +	off = (skb->data - skb->head) + nhead;
>  
>  	skb->head     = data;
>  	skb->head_frag = 0;

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>