linux-kernel - Re: [PATCH 4.19 09/56] btrfs: inode: Verify inode mode to avoid NULL pointer dereference

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Message-ID: <20200810180508.GG2026@suse.cz>
Date:   Mon, 10 Aug 2020 20:05:08 +0200
From:   David Sterba <dsterba@...e.cz>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Pavel Machek <pavel@...x.de>, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, Yoon Jungyeon <jungyeon@...ech.edu>,
        Nikolay Borisov <nborisov@...e.com>, Qu Wenruo <wqu@...e.com>,
        David Sterba <dsterba@...e.com>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 4.19 09/56] btrfs: inode: Verify inode mode to avoid NULL
 pointer dereference

On Tue, Aug 04, 2020 at 09:18:36AM +0200, Greg Kroah-Hartman wrote:
> On Tue, Aug 04, 2020 at 09:11:32AM +0200, Pavel Machek wrote:
> > Hi!
> > 
> > 
> > > @@ -6993,6 +7010,14 @@ struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
> > >  	extent_start = found_key.offset;
> > >  	if (found_type == BTRFS_FILE_EXTENT_REG ||
> > >  	    found_type == BTRFS_FILE_EXTENT_PREALLOC) {
> > > +		/* Only regular file could have regular/prealloc extent */
> > > +		if (!S_ISREG(inode->vfs_inode.i_mode)) {
> > > +			ret = -EUCLEAN;
> > > +			btrfs_crit(fs_info,
> > > +		"regular/prealloc extent found for non-regular inode %llu",
> > > +				   btrfs_ino(inode));
> > > +			goto out;
> > > +		}
> > 
> > This sets ret, but function returns err. Fix was already submitted.
> 
> What is the git commit id of that fix?

The fixup hasn't been merged yet, I'll send a pull request in a few days
so it should be in 5.9-rc1.

There's one more fixup of the stable candidate patch, 9f7fec0ba891
("Btrfs: fix selftests failure due to uninitialized i_mode in test
inodes"), so it would make most sense to take all three patches at once.