Re: [PATCH net] netfilter: nf_tables: fix pointer math issue in nft_byteorder_eval()

[Florian Westphal]

Dan Carpenter <dan.carpenter@xxxxxxxxxx> wrote:
> The problem is in nft_byteorder_eval() where we are iterating through a
> loop and writing to dst[0], dst[1], dst[2] and so on...  On each
> iteration we are writing 8 bytes.  But dst[] is an array of u32 so each
> element only has space for 4 bytes.  That means that every iteration
> overwrites part of the previous element.
> 
> I spotted this bug while reviewing commit caf3ef7468f7 ("netfilter:
> nf_tables: prevent OOB access in nft_byteorder_eval") which is a related
> issue.  I think that the reason we have not detected this bug in testing
> is that most of time we only write one element.

LGTM, thanks Dan.  We will route this via nf.git.