linux-kernel - [jj-apparmor:apparmor-next 4/43] security/apparmor/apparmorfs.c:1316:34: warning: variable 'ctx' is uninitialized when used here

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Date:   Sun, 25 Sep 2022 18:31:21 +0800
From:   kernel test robot <lkp@...el.com>
To:     Jon Tourville <jon.tourville@...onical.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        John Johansen <john.johansen@...onical.com>
Subject: [jj-apparmor:apparmor-next 4/43]
 security/apparmor/apparmorfs.c:1316:34: warning: variable 'ctx' is
 uninitialized when used here

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor.git apparmor-next
head:   14cd278924502473f444eaedb45d42c2c2f7f3fd
commit: 52ccc20c652bdb4233c935c82d210c32cf8c98f5 [4/43] apparmor: use zstd compression for profile data
config: x86_64-randconfig-a005
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1)
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://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor.git/commit/?id=52ccc20c652bdb4233c935c82d210c32cf8c98f5
        git remote add jj-apparmor https://git.kernel.org/pub/scm/linux/kernel/git/jj/linux-apparmor.git
        git fetch --no-tags jj-apparmor apparmor-next
        git checkout 52ccc20c652bdb4233c935c82d210c32cf8c98f5
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash security/apparmor/

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

All warnings (new ones prefixed by >>):

>> security/apparmor/apparmorfs.c:1316:34: warning: variable 'ctx' is uninitialized when used here [-Wuninitialized]
                   out_len = zstd_decompress_dctx(ctx, dst, dlen, src, slen);
                                                  ^~~
   security/apparmor/apparmorfs.c:1305:17: note: initialize the variable 'ctx' to silence this warning
                   zstd_dctx *ctx;
                                 ^
                                  = NULL
   1 warning generated.


vim +/ctx +1316 security/apparmor/apparmorfs.c

  1299	
  1300	static int decompress_zstd(char *src, size_t slen, char *dst, size_t dlen)
  1301	{
  1302	#ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY
  1303		if (aa_g_rawdata_compression_level == 0) {
  1304			const size_t wksp_len = zstd_dctx_workspace_bound();
  1305			zstd_dctx *ctx;
  1306			void *wksp;
  1307			size_t out_len;
  1308			int ret = 0;
  1309	
  1310			wksp = kvzalloc(wksp_len, GFP_KERNEL);
  1311			if (!wksp) {
  1312				ret = -ENOMEM;
  1313				goto cleanup;
  1314			}
  1315	
> 1316			out_len = zstd_decompress_dctx(ctx, dst, dlen, src, slen);
  1317			if (zstd_is_error(out_len)) {
  1318				ret = -EINVAL;
  1319				goto cleanup;
  1320			}
  1321	cleanup:
  1322			kvfree(wksp);
  1323			return ret;
  1324		}
  1325	#endif
  1326	
  1327		if (dlen < slen)
  1328			return -EINVAL;
  1329		memcpy(dst, src, slen);
  1330		return 0;
  1331	}
  1332	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp

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