fs: fat: handle "." and ".." of root dir correctly with fat_itr_resolve()
FAT's root directory does not have "." nor ".."
So care must be taken when scanning root directory with fat_itr_resolve().
Without this patch, any file path starting with "." or ".." will not be
resolved at all.
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
diff --git a/fs/fat/fat.c b/fs/fat/fat.c
index 5f921e8..c475f12 100644
--- a/fs/fat/fat.c
+++ b/fs/fat/fat.c
@@ -931,6 +931,27 @@
while (next[0] && !ISDIRDELIM(next[0]))
next++;
+ if (itr->is_root) {
+ /* root dir doesn't have "." nor ".." */
+ if ((((next - path) == 1) && !strncmp(path, ".", 1)) ||
+ (((next - path) == 2) && !strncmp(path, "..", 2))) {
+ /* point back to itself */
+ itr->clust = itr->fsdata->root_cluster;
+ itr->dent = NULL;
+ itr->remaining = 0;
+ itr->last_cluster = 0;
+
+ if (next[0] == 0) {
+ if (type & TYPE_DIR)
+ return 0;
+ else
+ return -ENOENT;
+ }
+
+ return fat_itr_resolve(itr, next, type);
+ }
+ }
+
while (fat_itr_next(itr)) {
int match = 0;
unsigned n = max(strlen(itr->name), (size_t)(next - path));