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Date: Mon, 22 Apr 2019 15:41:24 -0400 From: Sasha Levin <sashal@...nel.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: Jean-Philippe Brucker <jean-philippe.brucker@....com>, Neil Armstrong <narmstrong@...libre.com>, Sasha Levin <sashal@...nel.org>, dri-devel@...ts.freedesktop.org, linux-amlogic@...ts.infradead.org Subject: [PATCH AUTOSEL 5.0 57/98] drm/meson: Uninstall IRQ handler From: Jean-Philippe Brucker <jean-philippe.brucker@....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@....com> Acked-by: Neil Armstrong <narmstrong@...libre.com> Signed-off-by: Neil Armstrong <narmstrong@...libre.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190322152657.13752-2-jean-philippe.brucker@arm.com Signed-off-by: Sasha Levin (Microsoft) <sashal@...nel.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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