udf: Detect incorrect directory size

commit fa65653e575fbd958bdf5fb9c4a71a324e39510d upstream.

Detect when a directory entry is (possibly partially) beyond directory
size and return EIO in that case since it means the filesystem is
corrupted. Otherwise directory operations can further corrupt the
directory and possibly also oops the kernel.

CC: Anatoly Trosinenko <anatoly.trosinenko@gmail.com>
CC: stable@vger.kernel.org
Reported-and-tested-by: Anatoly Trosinenko <anatoly.trosinenko@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/udf/directory.c b/fs/udf/directory.c
index 7aa48bd7cbaf317b2301305137d7d9687bd211e8..a636b3b172199c6530675881c8e6ce2f7baf2e49 100644 (file)
--- a/fs/udf/directory.c
+++ b/fs/udf/directory.c
@@ -151,6 +151,9 @@ struct fileIdentDesc *udf_fileident_read(struct inode *dir, loff_t *nf_pos,
                               sizeof(struct fileIdentDesc));
                }
        }
+       /* Got last entry outside of dir size - fs is corrupted! */
+       if (*nf_pos > dir->i_size)
+               return NULL;
        return fi;
 }