linux-kernel - net/netfilter/nf_tables_api.c:2014:2: warning: Assignment of function parameter has no effect outside the function. Did you forget dereferencing it? [uselessAssignmentPtrArg]

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Date:   Thu, 27 Jan 2022 13:29:38 +0800
From:   kernel test robot <yujie.liu@...el.com>
To:     Pablo Neira Ayuso <pablo@...filter.org>
CC:     <kbuild-all@...ts.01.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: net/netfilter/nf_tables_api.c:2014:2: warning: Assignment of function
 parameter has no effect outside the function. Did you forget dereferencing
 it? [uselessAssignmentPtrArg]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   dd81e1c7d5fb126e5fbc5c9e334d7b3ec29a16a0
commit: 2c865a8a28a10e9800a3dd07ca339d24563e3d65 netfilter: nf_tables: add rule blob layout
date:   2 weeks ago
compiler: arceb-elf-gcc (GCC) 11.2.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>


cppcheck possible warnings: (new ones prefixed by >>, may not be real problems)

 >> net/netfilter/nf_tables_api.c:2014:2: warning: Assignment of function parameter has no effect outside the function. Did you forget dereferencing it? [uselessAssignmentPtrArg]
     ptr += offsetof(struct nft_rule_dp, data);
     ^

vim +2014 net/netfilter/nf_tables_api.c

0cbc06b3faba75 Florian Westphal  2018-05-25  2007
2c865a8a28a10e Pablo Neira Ayuso 2022-01-09  2008  static void nft_last_rule(struct nft_rule_blob *blob, const void *ptr)
0cbc06b3faba75 Florian Westphal  2018-05-25  2009  {
2c865a8a28a10e Pablo Neira Ayuso 2022-01-09  2010  	struct nft_rule_dp *prule;
2c865a8a28a10e Pablo Neira Ayuso 2022-01-09  2011
2c865a8a28a10e Pablo Neira Ayuso 2022-01-09  2012  	prule = (struct nft_rule_dp *)ptr;
2c865a8a28a10e Pablo Neira Ayuso 2022-01-09  2013  	prule->is_last = 1;
2c865a8a28a10e Pablo Neira Ayuso 2022-01-09 @2014  	ptr += offsetof(struct nft_rule_dp, data);
2c865a8a28a10e Pablo Neira Ayuso 2022-01-09  2015  	/* blob size does not include the trailer rule */
2c865a8a28a10e Pablo Neira Ayuso 2022-01-09  2016  }
2c865a8a28a10e Pablo Neira Ayuso 2022-01-09  2017

---
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