linux-kernel - fs/ksmbd/smb_common.c:350 smb1_allocate_rsp_buf() warn: Please consider using kzalloc instead of kmalloc

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Date:   Tue, 2 May 2023 14:31:20 +0300
From:   Dan Carpenter <dan.carpenter@...aro.org>
To:     oe-kbuild@...ts.linux.dev, Namjae Jeon <linkinjeon@...nel.org>
Cc:     lkp@...el.com, oe-kbuild-all@...ts.linux.dev,
        linux-kernel@...r.kernel.org, Steve French <stfrench@...rosoft.com>
Subject: fs/ksmbd/smb_common.c:350 smb1_allocate_rsp_buf() warn: Please
 consider using kzalloc instead of kmalloc

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   d06f5a3f7140921ada47d49574ae6fa4de5e2a89
commit: dc8289f912387c3bcfbc5d2db29c8947fa207c11 ksmbd: fix slab-out-of-bounds in init_smb2_rsp_hdr
config: openrisc-randconfig-m041-20230423 (https://download.01.org/0day-ci/archive/20230428/202304281001.oskkuJo0-lkp@intel.com/config)
compiler: or1k-linux-gcc (GCC) 12.1.0

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>
| Reported-by: Dan Carpenter <error27@...il.com>
| Link: https://lore.kernel.org/r/202304281001.oskkuJo0-lkp@intel.com/

smatch warnings:
fs/ksmbd/smb_common.c:350 smb1_allocate_rsp_buf() warn: Please consider using kzalloc instead of kmalloc

vim +350 fs/ksmbd/smb_common.c

dc8289f912387c Namjae Jeon 2023-04-01  348  static int smb1_allocate_rsp_buf(struct ksmbd_work *work)
dc8289f912387c Namjae Jeon 2023-04-01  349  {
dc8289f912387c Namjae Jeon 2023-04-01 @350  	work->response_buf = kmalloc(MAX_CIFS_SMALL_BUFFER_SIZE,
dc8289f912387c Namjae Jeon 2023-04-01  351  			GFP_KERNEL | __GFP_ZERO);

Someone else wrote this Smatch check to encourage people to use kzalloc()
instead of __GFP_ZERO.  I try stay out of style debates.  :P

dc8289f912387c Namjae Jeon 2023-04-01  352  	work->response_sz = MAX_CIFS_SMALL_BUFFER_SIZE;
dc8289f912387c Namjae Jeon 2023-04-01  353  
dc8289f912387c Namjae Jeon 2023-04-01  354  	if (!work->response_buf) {
dc8289f912387c Namjae Jeon 2023-04-01  355  		pr_err("Failed to allocate %u bytes buffer\n",
dc8289f912387c Namjae Jeon 2023-04-01  356  				MAX_CIFS_SMALL_BUFFER_SIZE);
dc8289f912387c Namjae Jeon 2023-04-01  357  		return -ENOMEM;
dc8289f912387c Namjae Jeon 2023-04-01  358  	}
dc8289f912387c Namjae Jeon 2023-04-01  359  
dc8289f912387c Namjae Jeon 2023-04-01  360  	return 0;
dc8289f912387c Namjae Jeon 2023-04-01  361  }

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