netfilter: nf_tables: fix pointer math issue in nft_byteorder_eval()

mainline inclusion
from mainline-v6.7-rc2
commit c301f0981fdd3fd1ffac6836b423c4d7a8e0eb63
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I8WQRG
CVE: CVE-2024-0607

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c301f0981fdd3fd1ffac6836b423c4d7a8e0eb63



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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 caf3ef74 ("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.

Fixes: ce1e7989 ("netfilter: nft_byteorder: provide 64bit le/be conversion")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Liu Jian <liujian56@huawei.com>

Conflicts:
	include/net/netfilter/nf_tables.h
	net/netfilter/nft_byteorder.c
	net/netfilter/nft_meta.c