From: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
To: narmstrong@baylibre.com
Cc: airlied@linux.ie, khilman@baylibre.com,
dri-devel@lists.freedesktop.org, daniel@ffwll.ch,
linux-amlogic@lists.infradead.org,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/2] drm/meson: Fix invalid pointer in meson_drv_unbind()
Date: Fri, 22 Mar 2019 15:26:56 +0000 [thread overview]
Message-ID: <20190322152657.13752-1-jean-philippe.brucker@arm.com> (raw)
meson_drv_bind() registers a meson_drm struct as the device's privdata,
but meson_drv_unbind() tries to retrieve a drm_device. This may cause a
segfault on shutdown:
[ 5194.593429] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000197
...
[ 5194.788850] Call trace:
[ 5194.791349] drm_dev_unregister+0x1c/0x118 [drm]
[ 5194.795848] meson_drv_unbind+0x50/0x78 [meson_drm]
Retrieve the right pointer in meson_drv_unbind().
Fixes: bbbe775ec5b5 ("drm: Add support for Amlogic Meson Graphic Controller")
Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
---
drivers/gpu/drm/meson/meson_drv.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/meson/meson_drv.c b/drivers/gpu/drm/meson/meson_drv.c
index 2281ed3eb774..7e85802c5398 100644
--- a/drivers/gpu/drm/meson/meson_drv.c
+++ b/drivers/gpu/drm/meson/meson_drv.c
@@ -356,8 +356,8 @@ static int meson_drv_bind(struct device *dev)
static void meson_drv_unbind(struct device *dev)
{
- struct drm_device *drm = dev_get_drvdata(dev);
- struct meson_drm *priv = drm->dev_private;
+ struct meson_drm *priv = dev_get_drvdata(dev);
+ struct drm_device *drm = priv->drm;
if (priv->canvas) {
meson_canvas_free(priv->canvas, priv->canvas_id_osd1);
--
2.20.1
_______________________________________________
linux-amlogic mailing list
linux-amlogic@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-amlogic
next reply other threads:[~2019-03-22 15:27 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-22 15:26 Jean-Philippe Brucker [this message]
2019-03-22 15:26 ` [PATCH 2/2] drm/meson: Uninstall IRQ handler Jean-Philippe Brucker
2019-03-23 9:54 ` Neil Armstrong
2019-03-23 9:53 ` [PATCH 1/2] drm/meson: Fix invalid pointer in meson_drv_unbind() Neil Armstrong
2019-03-25 10:19 ` Neil Armstrong
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=20190322152657.13752-1-jean-philippe.brucker@arm.com \
--to=jean-philippe.brucker@arm.com \
--cc=airlied@linux.ie \
--cc=daniel@ffwll.ch \
--cc=dri-devel@lists.freedesktop.org \
--cc=khilman@baylibre.com \
--cc=linux-amlogic@lists.infradead.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=narmstrong@baylibre.com \
/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;
as well as URLs for NNTP newsgroup(s).