> On Thu 27-08-20 14:28:43, Dinghao Liu wrote:
> > When ext4_journal_get_write_access() fails, we should release
> > n_group_desc, iloc.bh, dind and gdb_bh to prevent memleak.
> > It's the same when ext4_handle_dirty_super() fails, but we
> > don't need to release dind here because it has been released
> > before.
> >
> > Signed-off-by: Dinghao Liu <dinghao.liu@xxxxxxxxxx>
>
> Thanks for the patch! Some comments below:
>
> > diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
> > index a50b51270ea9..efc0a022ca8e 100644
> > --- a/fs/ext4/resize.c
> > +++ b/fs/ext4/resize.c
> > @@ -843,8 +843,10 @@ static int add_new_gdb(handle_t *handle, struct inode *inode,
> >
> > BUFFER_TRACE(dind, "get_write_access");
> > err = ext4_journal_get_write_access(handle, dind);
> > - if (unlikely(err))
> > + if (unlikely(err)) {
> > ext4_std_error(sb, err);
> > + goto errout;
> > + }
>
> This hunk looks good.
>
> > @@ -899,13 +901,17 @@ static int add_new_gdb(handle_t *handle, struct inode *inode,
> >
> > le16_add_cpu(&es->s_reserved_gdt_blocks, -1);
> > err = ext4_handle_dirty_super(handle, sb);
> > - if (err)
> > + if (err) {
> > ext4_std_error(sb, err);
> > + goto errsuper;
> > + }
> > +
> > return err;
> > errout:
> > + brelse(dind);
> > +errsuper:
>
> But this is definitely wrong. Look, n_group_desc and gdb_bh are already
> referenced from the superblock so you cannot free them, iloc.bh has been
> released in ext4_mark_iloc_dirty().
>
Thank you for your advice! It's clear to me and I will fix this soon.
Regards,
Dinghao
