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Message-ID: <951c65be-d4bb-4177-8106-67a72960fba6@gmx.de>
Date: Sun, 25 Oct 2026 08:57:02 +0100
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Subject: Re: [PATCH] video: fbdev: atmel_lcdfb: fix list_first_entry() on
 possibly empty modelist in probe
To: Li Ximo <lixicaicai@gmail.com>,
 Nicolas Ferre <nicolas.ferre@microchip.com>,
 Alexandre Belloni <alexandre.belloni@bootlin.com>,
 Claudiu Beznea <claudiu.beznea@tuxon.dev>
Cc: linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org,
 linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
 Wang Haoran <haoranwangsec@gmail.com>
References: <20261023075611.3559095-1-lixicaicai@gmail.com>
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On 10/23/26 09:56, Li Ximo wrote:
> From: Wang Haoran <haoranwangsec@gmail.com>
>=20
> list_first_entry() does not return NULL on an empty list; it returns a
> bogus pointer computed by container_of() from the list head.
> atmel_lcdfb_probe() initializes info->modelist with INIT_LIST_HEAD()
> and later takes its first entry with list_first_entry(), assuming
> atmel_lcdfb_of_init() populated it. However, atmel_lcdfb_of_init()
> drops the return value of fb_add_videomode() =E2=80=94 unlike every othe=
r
> fallible call in the same function =E2=80=94 so if fb_add_videomode() fa=
ils
> (its internal kmalloc can return -ENOMEM under memory pressure or
> fault injection), the list stays empty while of_init() reports
> success. The probe path then dereferences the bogus pointer in
> fb_videomode_to_var(&info->var, &modelist->mode). Because the bogus
> pointer lands inside the contiguous fb_info allocation, this may not
> fault immediately; instead it silently reads adjacent memory as a
> struct fb_videomode and programs garbage timing parameters into the
> LCD controller. This was found by code audit; we do not have Atmel
> hardware to reproduce it.
>=20
> Fix this on two levels: check the return value of fb_add_videomode()
> in atmel_lcdfb_of_init() so the failure is propagated (root cause),
> and use list_first_entry_or_null() in atmel_lcdfb_probe() with a NULL
> check that fails probe gracefully with -EINVAL (defense in depth),
> consistent with the surrounding error handling which bails out to
> stop_clk.
>=20
> Reported-by: Wang Haoran <haoranwangsec@gmail.com>
> Reported-by: Li Ximo <lixicaicai@gmail.com>
> Signed-off-by: Wang Haoran <haoranwangsec@gmail.com>
> ---
>   drivers/video/fbdev/atmel_lcdfb.c | 13 ++++++++++---
>   1 file changed, 10 insertions(+), 3 deletions(-)
applied.

Thanks!
Helge