ext4: force revalidation of directory pointer after seekdir(2)

A malicious user could force the directory pointer to be in an invalid
spot by using seekdir(2).  Use the mechanism we already have to notice
if the directory has changed since the last time we called
ext4_readdir() to force a revalidation of the pointer.

Reported-by: syzbot+1236ce66f79263e8a862@syzkaller.appspotmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org

1 files changed, 5 insertions, 3 deletions

diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c
index da87cf757f7d..e2902d394f1b 100644
--- a/fs/ext4/dir.c
+++ b/fs/ext4/dir.c
@@ -365,13 +365,15 @@ static loff_t ext4_dir_llseek(struct file *file, loff_t offset, int whence)
 {
         struct inode *inode = file->f_mapping->host;
         int dx_dir = is_dx_dir(inode);
-        loff_t htree_max = ext4_get_htree_eof(file);
+        loff_t ret, htree_max = ext4_get_htree_eof(file);
 
         if (likely(dx_dir))
-                return generic_file_llseek_size(file, offset, whence,
+                ret = generic_file_llseek_size(file, offset, whence,
                                                     htree_max, htree_max);
         else
-                return ext4_llseek(file, offset, whence);
+                ret = ext4_llseek(file, offset, whence);
+        file->f_version = inode_peek_iversion(inode) - 1;
+        return ret;
 }
 
 /*