Re: [PATCH] cifs: sanitize paths in cifs_update_super_prepath.

[kernel test robot <lkp@intel.com>]

Hi Thiago,

kernel test robot noticed the following build warnings:

[auto build test WARNING on cifs/for-next]
[also build test WARNING on linus/master v6.3-rc5 next-20230404]
[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/Thiago-Becker/cifs-sanitize-paths-in-cifs_update_super_prepath/20230405-030114
base:   git://git.samba.org/sfrench/cifs-2.6.git for-next
patch link:    https://lore.kernel.org/r/20230404185908.993738-1-tbecker%40redhat.com
patch subject: [PATCH] cifs: sanitize paths in cifs_update_super_prepath.
config: s390-allyesconfig (https://download.01.org/0day-ci/archive/20230405/202304050514.TB9sze0P-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/4d179c3f90c01aab96bf6a02f70cc111da39d61c
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Thiago-Becker/cifs-sanitize-paths-in-cifs_update_super_prepath/20230405-030114
        git checkout 4d179c3f90c01aab96bf6a02f70cc111da39d61c
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=s390 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash fs/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202304050514.TB9sze0P-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> fs/cifs/fs_context.c:448:7: warning: no previous prototype for 'sanitize_path' [-Wmissing-prototypes]
     448 | char *sanitize_path(char *path, gfp_t gfp)
         |       ^~~~~~~~~~~~~


vim +/sanitize_path +448 fs/cifs/fs_context.c

   438	
   439	/*
   440	 * Remove duplicate path delimiters. Windows is supposed to do that
   441	 * but there are some bugs that prevent rename from working if there are
   442	 * multiple delimiters.
   443	 *
   444	 * Returns a sanitized duplicate of @path. The caller is responsible for
   445	 * cleaning up the original.
   446	 */
   447	#define IS_DELIM(c) ((c) == '/' || (c) == '\\')
 > 448	char *sanitize_path(char *path, gfp_t gfp)
   449	{
   450		char *cursor1 = path, *cursor2 = path;
   451	
   452		/* skip all prepended delimiters */
   453		while (IS_DELIM(*cursor1))
   454			cursor1++;
   455	
   456		/* copy the first letter */
   457		*cursor2 = *cursor1;
   458	
   459		/* copy the remainder... */
   460		while (*(cursor1++)) {
   461			/* ... skipping all duplicated delimiters */
   462			if (IS_DELIM(*cursor1) && IS_DELIM(*cursor2))
   463				continue;
   464			*(++cursor2) = *cursor1;
   465		}
   466	
   467		/* if the last character is a delimiter, skip it */
   468		if (IS_DELIM(*(cursor2 - 1)))
   469			cursor2--;
   470	
   471		*(cursor2) = '\0';
   472		return kstrdup(path, gfp);
   473	}
   474	

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