linux-kernel - Re: [PATCH] spi: bitbang: Fix NULL pointer dereference in spi_unregister

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 16 May 2019 10:25:11 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     YueHaibing <yuehaibing@...wei.com>
Cc:     Mark Brown <broonie@...nel.org>, Axel Lin <axel.lin@...ics.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-spi <linux-spi@...r.kernel.org>, albeu@...e.fr,
        Lorenzo Bianconi <lorenzo.bianconi@...hat.com>
Subject: Re: [PATCH] spi: bitbang: Fix NULL pointer dereference in spi_unregister_master

On Thu, May 16, 2019 at 9:57 AM YueHaibing <yuehaibing@...wei.com> wrote:
> If spi_register_master fails in spi_bitbang_start
> because device_add failure, We should return the
> error code other than 0, otherwise calling
> spi_bitbang_stop may trigger NULL pointer dereference
> like this:
>
> BUG: KASAN: null-ptr-deref in __list_del_entry_valid+0x45/0xd0
> Read of size 8 at addr 0000000000000000 by task syz-executor.0/3661

[...]

> Reported-by: Hulk Robot <hulkci@...wei.com>
> Fixes: 702a4879ec33 ("spi: bitbang: Let spi_bitbang_start() take a reference to master")
> Signed-off-by: YueHaibing <yuehaibing@...wei.com>

Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds