From: Greg KH <gregkh@linuxfoundation.org>
To: Samuel Thibault <samuel.thibault@ens-lyon.org>,
Daniel Vetter <daniel@ffwll.ch>, Helge Deller <deller@gmx.de>,
linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org,
linux-kernel@vger.kernel.org, stable@vger.kernel.org,
Sanan Hasanov <sanan.hasanov@knights.ucf.edu>
Subject: Re: [PATCHv2] fbcon: Check font dimension limits
Date: Tue, 31 Jan 2023 15:51:13 +0100 [thread overview]
Message-ID: <Y9kq4ZoBs8LkEtqs@kroah.com> (raw)
In-Reply-To: <20230129151740.x5p7jj2pbuilpzzt@begin>
On Sun, Jan 29, 2023 at 04:17:40PM +0100, Samuel Thibault wrote:
> blit_x and blit_y are u32, so fbcon currently cannot support fonts
> larger than 32x32.
>
> The 32x32 case also needs shifting an unsigned int, to properly set bit
> 31, otherwise we get "UBSAN: shift-out-of-bounds in fbcon_set_font",
> as reported on:
>
> http://lore.kernel.org/all/IA1PR07MB98308653E259A6F2CE94A4AFABCE9@IA1PR07MB9830.namprd07.prod.outlook.com
> Kernel Branch: 6.2.0-rc5-next-20230124
> Kernel config: https://drive.google.com/file/d/1F-LszDAizEEH0ZX0HcSR06v5q8FPl2Uv/view?usp=sharing
> Reproducer: https://drive.google.com/file/d/1mP1jcLBY7vWCNM60OMf-ogw-urQRjNrm/view?usp=sharing
>
> Reported-by: Sanan Hasanov <sanan.hasanov@Knights.ucf.edu>
> Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
> Fixes: 2d2699d98492 ("fbcon: font setting should check limitation of driver")
> Cc: stable@vger.kernel.org
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
next prev parent reply other threads:[~2023-01-31 14:51 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-29 15:17 Samuel Thibault
2023-01-29 17:09 ` Miko Larsson
2023-01-31 14:51 ` Greg KH [this message]
2023-02-04 13:31 ` Helge Deller
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