From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>,
Sasha Levin <sashal@kernel.org>,
linux-amlogic@lists.infradead.org,
dri-devel@lists.freedesktop.org,
Neil Armstrong <narmstrong@baylibre.com>
Subject: [PATCH AUTOSEL 5.0 57/98] drm/meson: Uninstall IRQ handler
Date: Mon, 22 Apr 2019 15:41:24 -0400 [thread overview]
Message-ID: <20190422194205.10404-57-sashal@kernel.org> (raw)
In-Reply-To: <20190422194205.10404-1-sashal@kernel.org>
From: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
[ Upstream commit 2d8f92897ad816f5dda54b2ed2fd9f2d7cb1abde ]
meson_drv_unbind() doesn't unregister the IRQ handler, which can lead to
use-after-free if the IRQ fires after unbind:
[ 64.656876] Unable to handle kernel paging request at virtual address ffff000011706dbc
...
[ 64.662001] pc : meson_irq+0x18/0x30 [meson_drm]
I'm assuming that a similar problem could happen on the error path of
bind(), so uninstall the IRQ handler there as well.
Fixes: bbbe775ec5b5 ("drm: Add support for Amlogic Meson Graphic Controller")
Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190322152657.13752-2-jean-philippe.brucker@arm.com
Signed-off-by: Sasha Levin (Microsoft) <sashal@kernel.org>
---
drivers/gpu/drm/meson/meson_drv.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/meson/meson_drv.c b/drivers/gpu/drm/meson/meson_drv.c
index c1115a96453f..a13704ab5d11 100644
--- a/drivers/gpu/drm/meson/meson_drv.c
+++ b/drivers/gpu/drm/meson/meson_drv.c
@@ -317,12 +317,14 @@ static int meson_drv_bind_master(struct device *dev, bool has_components)
ret = drm_dev_register(drm, 0);
if (ret)
- goto free_drm;
+ goto uninstall_irq;
drm_fbdev_generic_setup(drm, 32);
return 0;
+uninstall_irq:
+ drm_irq_uninstall(drm);
free_drm:
drm_dev_put(drm);
@@ -347,6 +349,7 @@ static void meson_drv_unbind(struct device *dev)
}
drm_dev_unregister(drm);
+ drm_irq_uninstall(drm);
drm_kms_helper_poll_fini(drm);
drm_mode_config_cleanup(drm);
drm_dev_put(drm);
--
2.19.1
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prev parent reply other threads:[~2019-04-22 19:44 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20190422194205.10404-1-sashal@kernel.org>
2019-04-22 19:41 ` [PATCH AUTOSEL 5.0 56/98] drm/meson: Fix invalid pointer in meson_drv_unbind() Sasha Levin
2019-04-22 19:41 ` Sasha Levin [this message]
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