Re: [Xen-devel] [PATCH] xen-netback: Allocate fraglist early to avoid complex rollback

[David Miller <davem@xxxxxxxxxxxxx>]

From: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
Date: Mon, 3 Aug 2015 15:38:03 +0100

> Determine if a fraglist is needed in the tx path, and allocate it if
> necessary before setting up the copy and map operations.
> Otherwise, undoing the copy and map operations is tricky.
> 
> This fixes a use-after-free: if allocating the fraglist failed, the copy
> and map operations that had been set up were still executed, writing
> over the data area of a freed skb.
> 
> Signed-off-by: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>

Applied, thanks.

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