1 files changed, 69 insertions, 0 deletions
diff --git a/fs/xfs/scrub/symlink.c b/fs/xfs/scrub/symlink.c
new file mode 100644
index 000000000..75311f8da
--- /dev/null
+++ b/fs/xfs/scrub/symlink.c
@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2017 Oracle.  All Rights Reserved.
+ * Author: Darrick J. Wong <darrick.wong@oracle.com>
+ */
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_shared.h"
+#include "xfs_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_mount.h"
+#include "xfs_log_format.h"
+#include "xfs_inode.h"
+#include "xfs_symlink.h"
+#include "scrub/scrub.h"
+#include "scrub/common.h"
+
+/* Set us up to scrub a symbolic link. */
+int
+xchk_setup_symlink(
+	struct xfs_scrub	*sc)
+{
+	/* Allocate the buffer without the inode lock held. */
+	sc->buf = kvzalloc(XFS_SYMLINK_MAXLEN + 1, GFP_KERNEL);
+	if (!sc->buf)
+		return -ENOMEM;
+
+	return xchk_setup_inode_contents(sc, 0);
+}
+
+/* Symbolic links. */
+
+int
+xchk_symlink(
+	struct xfs_scrub	*sc)
+{
+	struct xfs_inode	*ip = sc->ip;
+	struct xfs_ifork	*ifp;
+	loff_t			len;
+	int			error = 0;
+
+	if (!S_ISLNK(VFS_I(ip)->i_mode))
+		return -ENOENT;
+	ifp = xfs_ifork_ptr(ip, XFS_DATA_FORK);
+	len = ip->i_disk_size;
+
+	/* Plausible size? */
+	if (len > XFS_SYMLINK_MAXLEN || len <= 0) {
+		xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
+		goto out;
+	}
+
+	/* Inline symlink? */
+	if (ifp->if_format == XFS_DINODE_FMT_LOCAL) {
+		if (len > xfs_inode_data_fork_size(ip) ||
+		    len > strnlen(ifp->if_u1.if_data, xfs_inode_data_fork_size(ip)))
+			xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
+		goto out;
+	}
+
+	/* Remote symlink; must read the contents. */
+	error = xfs_readlink_bmap_ilocked(sc->ip, sc->buf);
+	if (!xchk_fblock_process_error(sc, XFS_DATA_FORK, 0, &error))
+		goto out;
+	if (strnlen(sc->buf, XFS_SYMLINK_MAXLEN) < len)
+		xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, 0);
+out:
+	return error;
+}