[PATCH v3 2/2] initramfs: introduce do_readxattrs()

[kbuild test robot]

Hi Roberto,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v5.1 next-20190517]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Roberto-Sassu/initramfs-set-extended-attributes/20190518-055846
config: sparc64-allyesconfig (attached as .config)
compiler: sparc64-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=7.2.0 make.cross ARCH=sparc64 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp at intel.com>

All error/warnings (new ones prefixed by >>):

   init/initramfs.c: In function 'do_readxattrs':
>> init/initramfs.c:437:10: error: implicit declaration of function 'vmalloc'; did you mean 'kvmalloc'? [-Werror=implicit-function-declaration]
      path = vmalloc(file_entry_size);
             ^~~~~~~
             kvmalloc
>> init/initramfs.c:437:8: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
      path = vmalloc(file_entry_size);
           ^
>> init/initramfs.c:461:3: error: implicit declaration of function 'vfree'; did you mean 'kvfree'? [-Werror=implicit-function-declaration]
      vfree(path);
      ^~~~~
      kvfree
   cc1: some warnings being treated as errors

vim +437 init/initramfs.c

   391	
   392	static int __init do_readxattrs(void)
   393	{
   394		struct path_hdr hdr;
   395		char *path = NULL;
   396		char str[sizeof(hdr.p_size) + 1];
   397		unsigned long file_entry_size;
   398		size_t size, path_size, total_size;
   399		struct kstat st;
   400		struct file *file;
   401		loff_t pos;
   402		int ret;
   403	
   404		ret = vfs_lstat(XATTR_LIST_FILENAME, &st);
   405		if (ret < 0)
   406			return ret;
   407	
   408		total_size = st.size;
   409	
   410		file = filp_open(XATTR_LIST_FILENAME, O_RDONLY, 0);
   411		if (IS_ERR(file))
   412			return PTR_ERR(file);
   413	
   414		pos = file->f_pos;
   415	
   416		while (total_size) {
   417			size = kernel_read(file, (char *)&hdr, sizeof(hdr), &pos);
   418			if (size != sizeof(hdr)) {
   419				ret = -EIO;
   420				goto out;
   421			}
   422	
   423			total_size -= size;
   424	
   425			str[sizeof(hdr.p_size)] = 0;
   426			memcpy(str, hdr.p_size, sizeof(hdr.p_size));
   427			ret = kstrtoul(str, 16, &file_entry_size);
   428			if (ret < 0)
   429				goto out;
   430	
   431			file_entry_size -= sizeof(sizeof(hdr.p_size));
   432			if (file_entry_size > total_size) {
   433				ret = -EINVAL;
   434				goto out;
   435			}
   436	
 > 437			path = vmalloc(file_entry_size);
   438			if (!path) {
   439				ret = -ENOMEM;
   440				goto out;
   441			}
   442	
   443			size = kernel_read(file, path, file_entry_size, &pos);
   444			if (size != file_entry_size) {
   445				ret = -EIO;
   446				goto out_free;
   447			}
   448	
   449			total_size -= size;
   450	
   451			path_size = strnlen(path, file_entry_size);
   452			if (path_size == file_entry_size) {
   453				ret = -EINVAL;
   454				goto out_free;
   455			}
   456	
   457			xattr_buf = path + path_size + 1;
   458			xattr_len = file_entry_size - path_size - 1;
   459	
   460			ret = do_setxattrs(path);
 > 461			vfree(path);
   462			path = NULL;
   463	
   464			if (ret < 0)
   465				break;
   466		}
   467	out_free:
   468		vfree(path);
   469	out:
   470		fput(file);
   471	
   472		if (ret < 0)
   473			error("Unable to parse xattrs");
   474	
   475		return ret;
   476	}
   477	

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