From: Jan Kara <jack@xxxxxxx>
[ Upstream commit 1c80afa04db39c98aebea9aabfafa37a208cdfee ]
Implement searching for directory entry - udf_fiiter_find_entry() -
using new directory iteration code.
Reported-by: syzbot+69c9fdccc6dd08961d34@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Jan Kara <jack@xxxxxxx>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/udf/namei.c | 67 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 67 insertions(+)
--- a/fs/udf/namei.c
+++ b/fs/udf/namei.c
@@ -141,6 +141,73 @@ int udf_write_fi(struct inode *inode, st
}
/**
+ * udf_fiiter_find_entry - find entry in given directory.
+ *
+ * @dir: directory inode to search in
+ * @child: qstr of the name
+ * @iter: iter to use for searching
+ *
+ * This function searches in the directory @dir for a file name @child. When
+ * found, @iter points to the position in the directory with given entry.
+ *
+ * Returns 0 on success, < 0 on error (including -ENOENT).
+ */
+static int udf_fiiter_find_entry(struct inode *dir, const struct qstr *child,
+ struct udf_fileident_iter *iter)
+{
+ int flen;
+ unsigned char *fname = NULL;
+ struct super_block *sb = dir->i_sb;
+ int isdotdot = child->len == 2 &&
+ child->name[0] == '.' && child->name[1] == '.';
+ int ret;
+
+ fname = kmalloc(UDF_NAME_LEN, GFP_NOFS);
+ if (!fname)
+ return -ENOMEM;
+
+ for (ret = udf_fiiter_init(iter, dir, 0);
+ !ret && iter->pos < dir->i_size;
+ ret = udf_fiiter_advance(iter)) {
+ if (iter->fi.fileCharacteristics & FID_FILE_CHAR_DELETED) {
+ if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE))
+ continue;
+ }
+
+ if (iter->fi.fileCharacteristics & FID_FILE_CHAR_HIDDEN) {
+ if (!UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE))
+ continue;
+ }
+
+ if ((iter->fi.fileCharacteristics & FID_FILE_CHAR_PARENT) &&
+ isdotdot)
+ goto out_ok;
+
+ if (!iter->fi.lengthFileIdent)
+ continue;
+
+ flen = udf_get_filename(sb, iter->name,
+ iter->fi.lengthFileIdent, fname, UDF_NAME_LEN);
+ if (flen < 0) {
+ ret = flen;
+ goto out_err;
+ }
+
+ if (udf_match(flen, fname, child->len, child->name))
+ goto out_ok;
+ }
+ if (!ret)
+ ret = -ENOENT;
+
+out_err:
+ udf_fiiter_release(iter);
+out_ok:
+ kfree(fname);
+
+ return ret;
+}
+
+/**
* udf_find_entry - find entry in given directory.
*
* @dir: directory inode to search in
Patches currently in stable-queue which might be from cascardo@xxxxxxxxxx are
queue-5.15/udf-handle-error-when-expanding-directory.patch
queue-5.15/udf-convert-empty_dir-to-new-directory-iteration-code.patch
queue-5.15/udf-fix-bogus-checksum-computation-in-udf_rename.patch
queue-5.15/udf-convert-udf_expand_dir_adinicb-to-new-directory-iteration.patch
queue-5.15/udf-convert-udf_unlink-to-new-directory-iteration-code.patch
queue-5.15/udf-convert-udf_add_nondir-to-new-directory-iteration.patch
queue-5.15/udf-convert-udf_link-to-new-directory-iteration-code.patch
queue-5.15/udf-remove-old-directory-iteration-code.patch
queue-5.15/udf-don-t-return-bh-from-udf_expand_dir_adinicb.patch
queue-5.15/udf-new-directory-iteration-code.patch
queue-5.15/udf-convert-udf_rmdir-to-new-directory-iteration-code.patch
queue-5.15/udf-move-udf_expand_dir_adinicb-to-its-callsite.patch
queue-5.15/udf-convert-udf_readdir-to-new-directory-iteration.patch
queue-5.15/udf-convert-udf_mkdir-to-new-directory-iteration-code.patch
queue-5.15/udf-provide-function-to-mark-entry-as-deleted-using-new-directory-iteration-code.patch
queue-5.15/udf-convert-udf_lookup-to-use-new-directory-iteration-code.patch
queue-5.15/udf-implement-adding-of-dir-entries-using-new-iteration-code.patch
queue-5.15/udf-convert-udf_rename-to-new-directory-iteration-code.patch
queue-5.15/udf-convert-udf_get_parent-to-new-directory-iteration-code.patch
queue-5.15/udf-implement-searching-for-directory-entry-using-new-iteration-code.patch
