netdev - Re: [PATCH] net: sched: em_text: fix possible memory leak in em_text

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Date: Wed, 20 Dec 2023 23:13:56 +0800
From: kernel test robot <lkp@...el.com>
To: Hangyu Hua <hbh25y@...il.com>, jhs@...atatu.com,
	xiyou.wangcong@...il.com, jiri@...nulli.us, davem@...emloft.net,
	edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
	tgraf@...g.ch
Cc: oe-kbuild-all@...ts.linux.dev, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Hangyu Hua <hbh25y@...il.com>
Subject: Re: [PATCH] net: sched: em_text: fix possible memory leak in
 em_text_destroy()

Hi Hangyu,

kernel test robot noticed the following build warnings:

[auto build test WARNING on net-next/main]
[also build test WARNING on net/main linus/master v6.7-rc6]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Hangyu-Hua/net-sched-em_text-fix-possible-memory-leak-in-em_text_destroy/20231220-111317
base:   net-next/main
patch link:    https://lore.kernel.org/r/20231220030838.11751-1-hbh25y%40gmail.com
patch subject: [PATCH] net: sched: em_text: fix possible memory leak in em_text_destroy()
config: m68k-allmodconfig (https://download.01.org/0day-ci/archive/20231220/202312202228.58nFn5h0-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231220/202312202228.58nFn5h0-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202312202228.58nFn5h0-lkp@intel.com/

All warnings (new ones prefixed by >>):

   net/sched/em_text.c: In function 'em_text_destroy':
>> net/sched/em_text.c:102:24: warning: passing argument 1 of 'kfree' makes pointer from integer without a cast [-Wint-conversion]
     102 |                 kfree(m->data);
         |                       ~^~~~~~
         |                        |
         |                        long unsigned int
   In file included from net/sched/em_text.c:8:
   include/linux/slab.h:227:24: note: expected 'const void *' but argument is of type 'long unsigned int'
     227 | void kfree(const void *objp);
         |            ~~~~~~~~~~~~^~~~


vim +/kfree +102 net/sched/em_text.c

    97	
    98	static void em_text_destroy(struct tcf_ematch *m)
    99	{
   100		if (EM_TEXT_PRIV(m) && EM_TEXT_PRIV(m)->config) {
   101			textsearch_destroy(EM_TEXT_PRIV(m)->config);
 > 102			kfree(m->data);
   103		}
   104	}
   105	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki