fix: std::filesystem::path::iterator overflow issue

src/tebako-dfs.cpp

@@ -240,6 +240,9 @@ static int dwarfs_process_inode(filesystem_v2& fs,
                                 dwarfs::file_stat* st,
                                 bool follow,
                                 std::string& lnk,
+                                // Using  stdfs::path::iterator& below
+                                // causes std::bad_alloc at ++p_iterator
+                                // at least for gcc 12 headers. May be others as well.
                                 stdfs::path::iterator& p_iterator,
                                 stdfs::path& p_path)
 {
@@ -308,8 +311,6 @@ static int dwarfs_find_inode(uint32_t start_from,
 
       if (pi) {
         ret = dwarfs_process_inode(p->fs, *pi, &dwarfs_st, follow_last, lnk, p_iterator, p_path);
-        //(3) other stat calls (lstat, relative etc)
-
         while (p_iterator != p_path.end() && p_iterator->string() != "" && ret == DWARFS_IO_CONTINUE) {
           auto inode = pi->inode_num();
           auto mount_point = m_table.get(inode, p_iterator->string());
@@ -345,7 +346,9 @@ static int dwarfs_find_inode(uint32_t start_from,
               ret = DWARFS_IO_ERROR;
             }
           }
-          ++p_iterator;
+          if (p_iterator != p_path.end()) {
+            ++p_iterator;
+          }
         }
       }
       // Failed to find the start inode

tests/tests-defines-static.c

@@ -473,7 +473,7 @@ static int scandir_c_test(void)
   struct dirent** namelist;
   int n, i;
 
-#ifdef  WITH_LINK_TESTS
+#ifdef WITH_LINK_TESTS
   const int N = 7;
 #else
   const int N = 6;

tests/tests-ln.cpp

@@ -264,7 +264,6 @@ TEST_F(LnTests, tebako_lstat_level_2)
   EXPECT_EQ(25, st.st_size);
 }
 
-
 TEST_F(LnTests, tebako_lstat_absolute_path_no_file)
 {
   struct STAT_TYPE st;