added return code check whenever fstat () was called

docs/changes.txt

@@ -69,6 +69,7 @@
 - OpenCL Runtime: Updated AMDGPU-Pro driver version check, do warn if version 16.60 is detected which is known to be broken
 - OpenCL Kernel: Renumbered hash-mode 7600 to 4521
 - OpenCL Device: Do a check on available constant memory size and abort if it's less than 64kB
+- File Reads: Improved error detection on file reads, especially when getting the file stats
 - Sessions: Move out handling of multiple instance from restore file into separate pidfile
 - Threads: Restored strerror as %m is unsupported by the BSDs
 - Wordlists: Disable dictstat handling for hash-mode 3000 as it virtually creates words in the wordlist which is not the case for other modes

src/outfile_check.c

@@ -141,7 +141,7 @@ static int outfile_remove (hashcat_ctx_t *hashcat_ctx)
 
               hc_stat_t outfile_stat;
 
-              hc_fstat (fileno (fp), &outfile_stat);
+              if (hc_fstat (fileno (fp), &outfile_stat)) continue;
 
               if (outfile_stat.st_ctime > out_info[j].ctime)
               {

src/user_options.c

@@ -1572,7 +1572,7 @@ int user_options_check_files (hashcat_ctx_t *hashcat_ctx)
 
     if (tmp_outfile_fp)
     {
-      hc_fstat (fileno (tmp_outfile_fp), &tmpstat_outfile);
+      if (hc_fstat (fileno (tmp_outfile_fp), &tmpstat_outfile)) return -1;
 
       fclose (tmp_outfile_fp);
     }
@@ -1581,7 +1581,7 @@ int user_options_check_files (hashcat_ctx_t *hashcat_ctx)
 
     if (tmp_hashfile_fp)
     {
-      hc_fstat (fileno (tmp_hashfile_fp), &tmpstat_hashfile);
+      if (hc_fstat (fileno (tmp_hashfile_fp), &tmpstat_hashfile)) return -1;
 
       fclose (tmp_hashfile_fp);
     }

src/wordlist.c

@@ -285,7 +285,7 @@ u64 count_words (hashcat_ctx_t *hashcat_ctx, FILE *fd, const char *dictfile)
 
   d.cnt = 0;
 
-  hc_fstat (fileno (fd), &d.stat);
+  if (hc_fstat (fileno (fd), &d.stat)) return 0;
 
   d.stat.st_mode    = 0;
   d.stat.st_nlink   = 0;