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[176.150.251.154]) by smtp.gmail.com with ESMTPSA id 7sm34048903wrc.81.2019.03.23.02.54.04 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Sat, 23 Mar 2019 02:54:04 -0700 (PDT) Message-ID: <5C96023C.6050809@baylibre.com> Date: Sat, 23 Mar 2019 10:54:04 +0100 From: Neil Armstrong User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 MIME-Version: 1.0 To: Jean-Philippe Brucker Subject: Re: [PATCH 2/2] drm/meson: Uninstall IRQ handler References: <20190322152657.13752-1-jean-philippe.brucker@arm.com> <20190322152657.13752-2-jean-philippe.brucker@arm.com> In-Reply-To: <20190322152657.13752-2-jean-philippe.brucker@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190323_025408_045589_A86ACD8A X-CRM114-Status: GOOD ( 17.56 ) X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org Hi Jean-Philippe, Le 22/03/2019 16:26, Jean-Philippe Brucker a =E9crit : > 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 Controll= er") > Signed-off-by: Jean-Philippe Brucker > --- > drivers/gpu/drm/meson/meson_drv.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) Thanks for working on this, Acked-by: Neil Armstrong I'll push it on drm-misc-fixes > = > diff --git a/drivers/gpu/drm/meson/meson_drv.c b/drivers/gpu/drm/meson/me= son_drv.c > index 7e85802c5398..8a4ebcb6405c 100644 > --- a/drivers/gpu/drm/meson/meson_drv.c > +++ b/drivers/gpu/drm/meson/meson_drv.c > @@ -337,12 +337,14 @@ static int meson_drv_bind_master(struct device *dev= , bool has_components) > = > ret =3D 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); > = > @@ -367,6 +369,7 @@ 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); > = _______________________________________________ linux-amlogic mailing list linux-amlogic@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-amlogic