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-rw-r--r--fs/ksmbd/misc.c76
1 files changed, 67 insertions, 9 deletions
diff --git a/fs/ksmbd/misc.c b/fs/ksmbd/misc.c
index 0b307ca28a19..3eac3c01749f 100644
--- a/fs/ksmbd/misc.c
+++ b/fs/ksmbd/misc.c
@@ -191,19 +191,77 @@ int get_nlink(struct kstat *st)
return nlink;
}
-void ksmbd_conv_path_to_unix(char *path)
+char *ksmbd_conv_path_to_unix(char *path)
{
+ size_t path_len, remain_path_len, out_path_len;
+ char *out_path, *out_next;
+ int i, pre_dotdot_cnt = 0, slash_cnt = 0;
+ bool is_last;
+
strreplace(path, '\\', '/');
-}
+ path_len = strlen(path);
+ remain_path_len = path_len;
+ if (path_len == 0)
+ return ERR_PTR(-EINVAL);
-void ksmbd_strip_last_slash(char *path)
-{
- int len = strlen(path);
+ out_path = kzalloc(path_len + 2, GFP_KERNEL);
+ if (!out_path)
+ return ERR_PTR(-ENOMEM);
+ out_path_len = 0;
+ out_next = out_path;
+
+ do {
+ char *name = path + path_len - remain_path_len;
+ char *next = strchrnul(name, '/');
+ size_t name_len = next - name;
+
+ is_last = !next[0];
+ if (name_len == 2 && name[0] == '.' && name[1] == '.') {
+ pre_dotdot_cnt++;
+ /* handle the case that path ends with "/.." */
+ if (is_last)
+ goto follow_dotdot;
+ } else {
+ if (pre_dotdot_cnt) {
+follow_dotdot:
+ slash_cnt = 0;
+ for (i = out_path_len - 1; i >= 0; i--) {
+ if (out_path[i] == '/' &&
+ ++slash_cnt == pre_dotdot_cnt + 1)
+ break;
+ }
+
+ if (i < 0 &&
+ slash_cnt != pre_dotdot_cnt) {
+ kfree(out_path);
+ return ERR_PTR(-EINVAL);
+ }
+
+ out_next = &out_path[i+1];
+ *out_next = '\0';
+ out_path_len = i + 1;
- while (len && path[len - 1] == '/') {
- path[len - 1] = '\0';
- len--;
- }
+ }
+
+ if (name_len != 0 &&
+ !(name_len == 1 && name[0] == '.') &&
+ !(name_len == 2 && name[0] == '.' && name[1] == '.')) {
+ next[0] = '\0';
+ sprintf(out_next, "%s/", name);
+ out_next += name_len + 1;
+ out_path_len += name_len + 1;
+ next[0] = '/';
+ }
+ pre_dotdot_cnt = 0;
+ }
+
+ remain_path_len -= name_len + 1;
+ } while (!is_last);
+
+ if (out_path_len > 0)
+ out_path[out_path_len-1] = '\0';
+ path[path_len] = '\0';
+ return out_path;
}
void ksmbd_conv_path_to_windows(char *path)