Made callers of iso_file_source_get_path() aware that NULL might be returned.

libisofs/fs_image.c

@@ -392,6 +392,8 @@ char* ifs_get_path(IsoFileSource *src)
         char *path, *new_path;
         int pathlen;
 
+        if (data->name == NULL)
+            return NULL;
         path = ifs_get_path(data->parent);
         if (path == NULL)
             return NULL;

libisofs/fs_local.c

@@ -517,6 +517,10 @@ int lfs_get_aa_string(IsoFileSource *src, unsigned char **aa_string, int flag)
        to AAIP ACL representation. Clean out st_mode ACL entries.
     */ 
     path = iso_file_source_get_path(src);
+    if (path == NULL) {
+        ret = ISO_NULL_POINTER;
+        goto ex;
+    }
     ret = aaip_get_attr_list(path, &num_attrs, &names,
                              &value_lengths, &values,
                              (!(flag & 2)) | 2 | (flag & 4) | 16);

libisofs/stream.c

@@ -869,6 +869,10 @@ void iso_stream_get_file_name(IsoStream *stream, char *name)
     if (!strncmp(type, "fsrc", 4)) {
         FSrcStreamData *data = stream->data;
         char *path = iso_file_source_get_path(data->src);
+        if (path == NULL) {
+            name[0] = 0;
+            return;
+        }
         strncpy(name, path, PATH_MAX - 1);
         name[PATH_MAX - 1] = 0;
         free(path);

libisofs/tree.c

@@ -761,11 +761,16 @@ int iso_add_dir_src_rec(IsoImage *image, IsoDir *parent, IsoFileSource *dir)
 
     ret = iso_file_source_open(dir);
     if (ret < 0) {
-        char *path = iso_file_source_get_path(dir);
+        path = iso_file_source_get_path(dir);
         /* instead of the probable error, we throw a sorry event */
-        ret = iso_msg_submit(image->id, ISO_FILE_CANT_ADD, ret, 
-                             "Can't open dir %s", path);
-        free(path);
+	if (path != NULL) {
+            ret = iso_msg_submit(image->id, ISO_FILE_CANT_ADD, ret, 
+                                 "Can't open dir %s", path);
+            free(path);
+        } else {
+            ret = iso_msg_submit(image->id, ISO_NULL_POINTER, ret,
+                           "Can't open dir. NULL pointer caught as dir name");
+        }
         return ret;
     }
 
@@ -785,6 +790,11 @@ int iso_add_dir_src_rec(IsoImage *image, IsoDir *parent, IsoFileSource *dir)
         }
 
         path = iso_file_source_get_path(file);
+        if (path == NULL) {
+            ret = iso_msg_submit(image->id, ISO_NULL_POINTER, ret, 
+                                 "NULL pointer caught as file path");
+            return ret;
+        }
         name = strrchr(path, '/') + 1;
 
         if (image->follow_symlinks) {