Messages in this thread | | | Date | Tue, 27 Nov 2018 10:14:53 +0100 | From | Jan Kara <> | Subject | Re: [PATCH] ext4: fix possible use after free in ext4_quota_enable |
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On Mon 26-11-18 11:21:06, Pan Bian wrote: > The function frees qf_inode via iput but then pass qf_inode to > lockdep_set_quota_inode on the failure path. This may result in a > use-after-free bug. The patch frees df_inode only when it is never used. > > Signed-off-by: Pan Bian <bianpan2016@163.com> > Fixes: daf647d2dd5("ext4: add lockdep annotations for i_data_sem")
Thanks for the fix! The patch looks good. You can add:
Reviewed-by: Jan Kara <jack@suse.cz>
Honza
> --- > fs/ext4/super.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/fs/ext4/super.c b/fs/ext4/super.c > index 53ff6c2..35689eb 100644 > --- a/fs/ext4/super.c > +++ b/fs/ext4/super.c > @@ -5690,9 +5690,9 @@ static int ext4_quota_enable(struct super_block *sb, int type, int format_id, > qf_inode->i_flags |= S_NOQUOTA; > lockdep_set_quota_inode(qf_inode, I_DATA_SEM_QUOTA); > err = dquot_enable(qf_inode, type, format_id, flags); > - iput(qf_inode); > if (err) > lockdep_set_quota_inode(qf_inode, I_DATA_SEM_NORMAL); > + iput(qf_inode); > > return err; > } > -- > 2.7.4 > > -- Jan Kara <jack@suse.com> SUSE Labs, CR
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