From: maxime.ripard@bootlin.com (Maxime Ripard)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 1/2] drm/sun4i: tcon: fix check of tcon->panel null pointer
Date: Thu, 4 Oct 2018 21:54:06 +0200 [thread overview]
Message-ID: <20181004195406.prjuko556tnuau2u@flea> (raw)
In-Reply-To: <20181003142458.33120-1-giulio.benetti@micronovasrl.com>
Hi,
On Wed, Oct 03, 2018 at 04:24:57PM +0200, Giulio Benetti wrote:
> At the moment, the check of tcon->panel to be valid is wrong. IS_ERR()
> has been used, but that macro doesn't check if tcon->panel pointer is
> null or not, but check if tcon->panel is between -1 and -4095(MAX_ERRNO).
>
> Remove IS_ERR() from tcon->panel checking and let "if (tcon->panel)" as
> condition to check if it's a pointer not null.
>
> Signed-off-by: Giulio Benetti <giulio.benetti@micronovasrl.com>
The commit log should be improved. The issue isn't really with the
IS_ERR macro as you suggest, but that what is returned by
of_drm_find_panel, and thus stored in tcon->panel. is not an error
pointer in the first place but a NULL pointer on error. So the check
doesn't check for the proper thing.
Maxime
--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 833 bytes
Desc: not available
URL: <http://lists.infradead.org/pipermail/linux-arm-kernel/attachments/20181004/5728b4a0/attachment.sig>
prev parent reply other threads:[~2018-10-04 19:54 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20181001093612.GA13672@mwanda>
2018-10-02 20:48 ` [PATCH 1/2] drm/sun4i: tcon: fix check of tcon->panel null pointer Giulio Benetti
2018-10-02 20:49 ` [PATCH 2/2] drm/sun4i: tcon: prevent tcon->panel dereference if null Giulio Benetti
2018-10-02 21:59 ` [PATCH 1/2] drm/sun4i: tcon: fix check of tcon->panel null pointer Giulio Benetti
2018-10-02 21:59 ` [PATCH 2/2] drm/sun4i: tcon: prevent tcon->panel dereference if null Giulio Benetti
2018-10-03 7:34 ` Chen-Yu Tsai
2018-10-02 22:00 ` [PATCH 1/2] drm/sun4i: tcon: fix check of tcon->panel null pointer Giulio Benetti
2018-10-03 9:43 ` Chen-Yu Tsai
2018-10-03 12:13 ` Giulio Benetti
2018-10-03 14:24 ` [PATCH v2 " Giulio Benetti
2018-10-03 14:24 ` [PATCH v2 2/2] drm/sun4i: tcon: prevent tcon->panel dereference if null Giulio Benetti
2018-10-04 19:56 ` Maxime Ripard
2018-10-05 21:38 ` Giulio Benetti
2018-10-05 21:59 ` [PATCH v3 1/2] drm/sun4i: tcon: fix check of tcon->panel null pointer Giulio Benetti
2018-10-05 21:59 ` [PATCH v3 2/2] drm/sun4i: tcon: prevent tcon->panel dereference if NULL Giulio Benetti
2018-10-08 9:21 ` Maxime Ripard
2018-10-12 10:03 ` Chen-Yu Tsai
2018-11-05 13:23 ` Icenowy Zheng
2018-11-06 15:57 ` Maxime Ripard
2018-10-04 19:54 ` Maxime Ripard [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20181004195406.prjuko556tnuau2u@flea \
--to=maxime.ripard@bootlin.com \
--cc=linux-arm-kernel@lists.infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox