From: Colin Ian King <colin.king@canonical.com>
To: "Guido Günther" <guido.gunther@puri.sm>
Cc: Purism Kernel Team <kernel@puri.sm>,
David Airlie <airlied@linux.ie>,
kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org,
dri-devel@lists.freedesktop.org,
Thierry Reding <thierry.reding@gmail.com>,
Sam Ravnborg <sam@ravnborg.org>
Subject: Re: [PATCH][next] drm/panel: fix null pointer dereference on pointer mode
Date: Fri, 18 Sep 2020 16:39:45 +0000 [thread overview]
Message-ID: <32528660-a9b0-75b2-264d-26d6dc90180c@canonical.com> (raw)
In-Reply-To: <20200918162249.GA292461@bogon.m.sigxcpu.org>
On 18/09/2020 17:22, Guido Günther wrote:
> Hi,
> On Fri, Sep 18, 2020 at 04:51:36PM +0100, Colin King wrote:
>> From: Colin Ian King <colin.king@canonical.com>
>>
>> Currently a null pointer check on pointer mode is passing mode to
>> function drm_mode_vrefresh and this causes a null pointer dereference
>> on mode. Fix this by not calling drm_mode_vrefresh since the call
>> is only required for error reporting.
>>
>> Addresses-Coverity: ("Dereference after null check")
>> Fixes: 72967d5616d3 ("drm/panel: Add panel driver for the Mantix MLAF057WE51-X DSI panel")
>> Signed-off-by: Colin Ian King <colin.king@canonical.com>
>> ---
>> drivers/gpu/drm/panel/panel-mantix-mlaf057we51.c | 5 ++---
>> 1 file changed, 2 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/panel/panel-mantix-mlaf057we51.c b/drivers/gpu/drm/panel/panel-mantix-mlaf057we51.c
>> index 3482e28e30fc..be4761a643f9 100644
>> --- a/drivers/gpu/drm/panel/panel-mantix-mlaf057we51.c
>> +++ b/drivers/gpu/drm/panel/panel-mantix-mlaf057we51.c
>> @@ -202,9 +202,8 @@ static int mantix_get_modes(struct drm_panel *panel,
>>
>> mode = drm_mode_duplicate(connector->dev, &default_mode);
>> if (!mode) {
>> - dev_err(ctx->dev, "Failed to add mode %ux%u@%u\n",
>> - default_mode.hdisplay, default_mode.vdisplay,
>> - drm_mode_vrefresh(mode));
>> + dev_err(ctx->dev, "Failed to add mode %ux%u\n",
>> + default_mode.hdisplay, default_mode.vdisplay);
>> return -ENOMEM;
>> }
>
> drm_mode_vrefresh(&default_mode) gives some more clue what's going on -
> I have had a fix queued up in my tree already but if you send a v2
> that's fine.
I'll defer to your queued up fix.
>
> Thanks!
> -- Guido
>
>>
>> --
>> 2.27.0
>>
prev parent reply other threads:[~2020-09-18 16:39 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-18 15:51 [PATCH][next] drm/panel: fix null pointer dereference on pointer mode Colin King
2020-09-18 16:22 ` Guido Günther
2020-09-18 16:39 ` Colin Ian King [this message]
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