Re: [PATCH 3/5] tmpfs: Create casefold mount options

[Dan Carpenter]

Hi André,

kernel test robot noticed the following build warnings:

https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Andr-Almeida/tmpfs-Add-casefold-lookup-support/20240826-135457
base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
patch link:    https://lore.kernel.org/r/20240823173332.281211-4-andrealmeid%40igalia.com
patch subject: [PATCH 3/5] tmpfs: Create casefold mount options
config: x86_64-randconfig-161-20240827 (https://download.01.org/0day-ci/archive/20240829/202408290349.lp2Eq74b-lkp@xxxxxxxxx/config)
compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1)

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@xxxxxxxxx>
| Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
| Closes: https://lore.kernel.org/r/202408290349.lp2Eq74b-lkp@xxxxxxxxx/

smatch warnings:
mm/shmem.c:4307 shmem_parse_opt_casefold() error: uninitialized symbol 'maj'.
mm/shmem.c:4307 shmem_parse_opt_casefold() error: uninitialized symbol 'min'.
mm/shmem.c:4307 shmem_parse_opt_casefold() error: uninitialized symbol 'rev'.

vim +/maj +4307 mm/shmem.c

a024e87c2944676 André Almeida 2024-08-23  4291  static int shmem_parse_opt_casefold(struct fs_context *fc, struct fs_parameter *param)
a024e87c2944676 André Almeida 2024-08-23  4292  {
a024e87c2944676 André Almeida 2024-08-23  4293  	struct shmem_options *ctx = fc->fs_private;
a024e87c2944676 André Almeida 2024-08-23  4294  	unsigned int maj, min, rev, version_number;
a024e87c2944676 André Almeida 2024-08-23  4295  	char version[10];
a024e87c2944676 André Almeida 2024-08-23  4296  	int ret;
a024e87c2944676 André Almeida 2024-08-23  4297  	struct unicode_map *encoding;
a024e87c2944676 André Almeida 2024-08-23  4298  
a024e87c2944676 André Almeida 2024-08-23  4299  	if (strncmp(param->string, "utf8-", 5))
a024e87c2944676 André Almeida 2024-08-23  4300  		return invalfc(fc, "Only utf8 encondings are supported");
a024e87c2944676 André Almeida 2024-08-23  4301  	ret = strscpy(version, param->string + 5, sizeof(version));
a024e87c2944676 André Almeida 2024-08-23  4302  	if (ret < 0)
a024e87c2944676 André Almeida 2024-08-23  4303  		return invalfc(fc, "Invalid enconding argument: %s",
a024e87c2944676 André Almeida 2024-08-23  4304  			       param->string);
a024e87c2944676 André Almeida 2024-08-23  4305  
a024e87c2944676 André Almeida 2024-08-23  4306  	utf8_parse_version(version, &maj, &min, &rev);

No error checking

a024e87c2944676 André Almeida 2024-08-23 @4307  	version_number = UNICODE_AGE(maj, min, rev);
                                                                                     ^^^^^^^^^^^^^

a024e87c2944676 André Almeida 2024-08-23  4308  	encoding = utf8_load(version_number);
a024e87c2944676 André Almeida 2024-08-23  4309  	if (IS_ERR(encoding))
a024e87c2944676 André Almeida 2024-08-23  4310  		return invalfc(fc, "Invalid utf8 version: %s", version);
a024e87c2944676 André Almeida 2024-08-23  4311  	pr_info("tmpfs: Using encoding provided by mount options: %s\n",
a024e87c2944676 André Almeida 2024-08-23  4312  		param->string);
a024e87c2944676 André Almeida 2024-08-23  4313  	ctx->encoding = encoding;
a024e87c2944676 André Almeida 2024-08-23  4314  
a024e87c2944676 André Almeida 2024-08-23  4315  	return 0;
a024e87c2944676 André Almeida 2024-08-23  4316  }
a024e87c2944676 André Almeida 2024-08-23  4317  #else
a024e87c2944676 André Almeida 2024-08-23  4318  static int shmem_parse_opt_casefold(struct fs_context *fc, struct fs_parameter *param)
a024e87c2944676 André Almeida 2024-08-23  4319  {
a024e87c2944676 André Almeida 2024-08-23  4320  	return invalfc(fc, "tmpfs: No kernel support for casefold filesystems\n");
a024e87c2944676 André Almeida 2024-08-23  4321  }

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