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
{
struct inode *inode = file->f_mapping->host;
int dx_dir = is_dx_dir(inode);
{
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);
- return generic_file_llseek_size(file, offset, whence,
+ ret = generic_file_llseek_size(file, offset, whence,
htree_max, htree_max);
else
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;