bug#50767: 28.0.50; Warnings about snprintf in image.c on armv7l

[Alan Third]

On Thu, Sep 23, 2021 at 11:49:37PM +0100, Alan Third wrote:
> On Thu, Sep 23, 2021 at 11:38:06PM +0100, Basil L. Contovounesios wrote:
> > ...which would mean this only holds in the common case that
> > face_font_size has fewer than 5 digits, right?
> 
> Looks that way.
> 
> I suppose in this particular case we could limit the font size to a
> maximum of 9999 or something, but surely there's a better way of
> calculating string sizes?

I've implemented a pretty basic check so we shouldn't accidentally
overrun the buffer. See attached.

-- 
Alan Third

0001-Fix-potential-buffer-overflow-bug-50767.patch
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