ufs: ensure fast symlinks are NUL-terminated

Ensure fast symlink targets are NUL-terminated, even if corrupted
on-disk.

Signed-off-by: Duane Griffin <duaneg@dghda.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 4 insertions, 2 deletions

diff --git a/fs/ufs/inode.c b/fs/ufs/inode.c
index ac8b324415d3..3d2512c21f05 100644
--- a/fs/ufs/inode.c
+++ b/fs/ufs/inode.c
@@ -658,7 +658,8 @@ static int ufs1_read_inode(struct inode *inode, struct ufs_inode *ufs_inode)
                        sizeof(ufs_inode->ui_u2.ui_addr));
         } else {
                 memcpy(ufsi->i_u1.i_symlink, ufs_inode->ui_u2.ui_symlink,
-                       sizeof(ufs_inode->ui_u2.ui_symlink));
+                       sizeof(ufs_inode->ui_u2.ui_symlink) - 1);
+                ufsi->i_u1.i_symlink[sizeof(ufs_inode->ui_u2.ui_symlink) - 1] = 0;
         }
         return 0;
 }
@@ -706,7 +707,8 @@ static int ufs2_read_inode(struct inode *inode, struct ufs2_inode *ufs2_inode)
                        sizeof(ufs2_inode->ui_u2.ui_addr));
         } else {
                 memcpy(ufsi->i_u1.i_symlink, ufs2_inode->ui_u2.ui_symlink,
-                       sizeof(ufs2_inode->ui_u2.ui_symlink));
+                       sizeof(ufs2_inode->ui_u2.ui_symlink) - 1);
+                ufsi->i_u1.i_symlink[sizeof(ufs2_inode->ui_u2.ui_symlink) - 1] = 0;
         }
         return 0;
 }