[PATCH 3/4] xfs: namecheck directory entry names before listing them

["Darrick J. Wong" <darrick.wong@xxxxxxxxxx>]

From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>

Actually call namecheck on directory entry names before we hand them
over to userspace.

Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
---
 fs/xfs/xfs_dir2_readdir.c |   16 ++++++++++++++++
 1 file changed, 16 insertions(+)


diff --git a/fs/xfs/xfs_dir2_readdir.c b/fs/xfs/xfs_dir2_readdir.c
index 283df898dd9f..a8fb0a6829fd 100644
--- a/fs/xfs/xfs_dir2_readdir.c
+++ b/fs/xfs/xfs_dir2_readdir.c
@@ -17,6 +17,7 @@
 #include "xfs_trace.h"
 #include "xfs_bmap.h"
 #include "xfs_trans.h"
+#include "xfs_error.h"
 
 /*
  * Directory file type support functions
@@ -115,6 +116,11 @@ xfs_dir2_sf_getdents(
 		ino = dp->d_ops->sf_get_ino(sfp, sfep);
 		filetype = dp->d_ops->sf_get_ftype(sfep);
 		ctx->pos = off & 0x7fffffff;
+		if (!xfs_dir2_namecheck(sfep->name, sfep->namelen)) {
+			XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW,
+					 dp->i_mount);
+			return -EFSCORRUPTED;
+		}
 		if (!dir_emit(ctx, (char *)sfep->name, sfep->namelen, ino,
 			    xfs_dir3_get_dtype(dp->i_mount, filetype)))
 			return 0;
@@ -208,6 +214,11 @@ xfs_dir2_block_getdents(
 		/*
 		 * If it didn't fit, set the final offset to here & return.
 		 */
+		if (!xfs_dir2_namecheck(dep->name, dep->namelen)) {
+			XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW,
+					 dp->i_mount);
+			return -EFSCORRUPTED;
+		}
 		if (!dir_emit(ctx, (char *)dep->name, dep->namelen,
 			    be64_to_cpu(dep->inumber),
 			    xfs_dir3_get_dtype(dp->i_mount, filetype))) {
@@ -456,6 +467,11 @@ xfs_dir2_leaf_getdents(
 		filetype = dp->d_ops->data_get_ftype(dep);
 
 		ctx->pos = xfs_dir2_byte_to_dataptr(curoff) & 0x7fffffff;
+		if (!xfs_dir2_namecheck(dep->name, dep->namelen)) {
+			XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW,
+					 dp->i_mount);
+			return -EFSCORRUPTED;
+		}
 		if (!dir_emit(ctx, (char *)dep->name, dep->namelen,
 			    be64_to_cpu(dep->inumber),
 			    xfs_dir3_get_dtype(dp->i_mount, filetype)))