netdev - Re: [PATCH bpf-next] bpf, test_run: fix alignment problem in bpf_test

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Date:   Tue, 6 Dec 2022 09:26:46 +0800
From:   kernel test robot <lkp@...el.com>
To:     Zhengchao Shao <shaozhengchao@...wei.com>, bpf@...r.kernel.org,
        netdev@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        andrii@...nel.org, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com
Cc:     oe-kbuild-all@...ts.linux.dev, martin.lau@...ux.dev,
        song@...nel.org, yhs@...com, john.fastabend@...il.com,
        kpsingh@...nel.org, sdf@...gle.com, haoluo@...gle.com,
        jolsa@...nel.org, syzkaller-bugs@...glegroups.com,
        weiyongjun1@...wei.com, yuehaibing@...wei.com,
        shaozhengchao@...wei.com
Subject: Re: [PATCH bpf-next] bpf, test_run: fix alignment problem in
 bpf_test_init()

Hi Zhengchao,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on bpf-next/master]

url:    https://github.com/intel-lab-lkp/linux/commits/Zhengchao-Shao/bpf-test_run-fix-alignment-problem-in-bpf_test_init/20221129-122226
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
patch link:    https://lore.kernel.org/r/20221129042644.231816-1-shaozhengchao%40huawei.com
patch subject: [PATCH bpf-next] bpf, test_run: fix alignment problem in bpf_test_init()
config: i386-randconfig-m021-20221205
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0

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

smatch warnings:
net/bpf/test_run.c:786 bpf_test_init() warn: inconsistent indenting

vim +786 net/bpf/test_run.c

   764	
   765	static void *bpf_test_init(const union bpf_attr *kattr, u32 user_size,
   766				   u32 size, u32 headroom, u32 tailroom)
   767	{
   768		void __user *data_in = u64_to_user_ptr(kattr->test.data_in);
   769		unsigned int true_size;
   770		void *true_data;
   771		void *data;
   772	
   773		if (size < ETH_HLEN || size > PAGE_SIZE - headroom - tailroom)
   774			return ERR_PTR(-EINVAL);
   775	
   776		if (user_size > size)
   777			return ERR_PTR(-EMSGSIZE);
   778	
   779		data = kzalloc(size + headroom + tailroom, GFP_USER);
   780		if (!data)
   781			return ERR_PTR(-ENOMEM);
   782	
   783		true_size = ksize(data);
   784		if (size + headroom + tailroom < true_size) {
   785			true_data = krealloc(data, true_size, GFP_USER | __GFP_ZERO);
 > 786				if (!true_data)
   787					return ERR_PTR(-ENOMEM);
   788			data = true_data;
   789		}
   790	
   791		if (copy_from_user(data + headroom, data_in, user_size)) {
   792			kfree(data);
   793			return ERR_PTR(-EFAULT);
   794		}
   795	
   796		return data;
   797	}
   798	

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