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SubjectRe: [PATCH 4.9 37/95] ext4: add validity checks for bitmap block numbers
On Mon, Apr 23, 2018 at 02:03:52AM -0400, Theodore Y. Ts'o wrote:
> On Sun, Apr 22, 2018 at 10:54:23PM +0100, Ben Hutchings wrote:
> > > offset = blk - group_first_block;
> > > - if (!ext4_test_bit(EXT4_B2C(sbi, offset), bh->b_data))
> > > + if (offset < 0 || EXT4_B2C(sbi, offset) >= sb->s_blocksize ||
> > > + !ext4_test_bit(EXT4_B2C(sbi, offset), bh->b_data))
> >
> > Isn't sb->s_blocksize a count of bytes? If so, doesn't that mean that
> > we should be comparing with sb->s_blocksize * 8?
>
> Yes, nice catch, Ben! Can we temporarily drop this patch from the
> stable queue until I can get a fix in?
>
> In practice this shouldn't be a problem because of the default ext4
> layout with flex_bg. But we should definitely get this fixed before
> we let this flow into the stable kernel.

Now dropped from all queues. When you submit the fix, can you also tag
it for stable so I know to pick this one back up?

thanks,

greg k-h

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