jfs: ensure symlinks are NUL-terminated

This is an alternate fix for a bug reported and fixed by Duane Griffin.

Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
Reported-by: Duane Griffin <duaneg@dghda.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/fs/jfs/inode.c b/fs/jfs/inode.c
index 210339784b56..b00ee9f05a06 100644
--- a/fs/jfs/inode.c
+++ b/fs/jfs/inode.c
@@ -59,8 +59,14 @@ struct inode *jfs_iget(struct super_block *sb, unsigned long ino)
                 if (inode->i_size >= IDATASIZE) {
                         inode->i_op = &page_symlink_inode_operations;
                         inode->i_mapping->a_ops = &jfs_aops;
-                } else
+                } else {
                         inode->i_op = &jfs_symlink_inode_operations;
+                        /*
+                         * The inline data should be null-terminated, but
+                         * don't let on-disk corruption crash the kernel
+                         */
+                        JFS_IP(inode)->i_inline[inode->i_size] = '\0';
+                }
         } else {
                 inode->i_op = &jfs_file_inode_operations;
                 init_special_inode(inode, inode->i_mode, inode->i_rdev);