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Sat, 30 May 2026 02:44:09 -0700 (PDT) From: Anand Moon To: Neil Armstrong , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Kevin Hilman , Jerome Brunet , Martin Blumenstingl , Mauro Carvalho Chehab , Greg Kroah-Hartman , Maxime Jourdan , Hans Verkuil , dri-devel@lists.freedesktop.org (open list:DRM DRIVERS FOR AMLOGIC SOCS), linux-amlogic@lists.infradead.org (open list:DRM DRIVERS FOR AMLOGIC SOCS), linux-arm-kernel@lists.infradead.org (moderated list:ARM/Amlogic Meson SoC support), linux-kernel@vger.kernel.org (open list), linux-media@vger.kernel.org (open list:MESON VIDEO DECODER DRIVER FOR AMLOGIC SOCS), linux-staging@lists.linux.dev (open list:STAGING SUBSYSTEM) Cc: Anand Moon , Nicolas Dufresne , Sashiko Subject: [PATCH v6 1/8] media: meson: vdec: Fix memory leaks and lifetime of m2m device Date: Sat, 30 May 2026 15:12:47 +0530 Message-ID: <20260530094326.11892-2-linux.amoon@gmail.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20260530094326.11892-1-linux.amoon@gmail.com> References: <20260530094326.11892-1-linux.amoon@gmail.com> Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The driver was initializing the v4l2 m2m device instance per-session within vdec_open() and releasing it inside vdec_close(). This approach is faulty because the m2m device represents the hardware context and should persist across multiple open sessions. Fix this design flaw by shifting v4l2_m2m_init() to vdec_probe() and v4l2_m2m_release() to vdec_remove(). Correspondingly, move the m2m_dev pointer from struct amvdec_session to struct amvdec_core. Additionally, this patch addresses two critical resource leaks: 1. Adds a missing v4l2_ctrl_handler_free() in vdec_close() to clean up allocated control handlers upon session closure. 2. Introduces proper unwinding logic via a new 'err_fh_del' label in vdec_open() to ensure that file handles (v4l2_fh) are fully deregistered if subsequent session resource allocations fail. This was identified via kmemleak: unreferenced object 0xffff0000205d6878 (size 8): comm "v4l_id", pid 5289, jiffies 4294938580 hex dump (first 8 bytes): 40 d2 49 18 00 00 ff ff @.I..... backtrace (crc d3204599): kmemleak_alloc+0xc8/0xf0 __kvmalloc_node_noprof+0x60c/0x850 v4l2_ctrl_handler_init_class+0x1b4/0x2e8 [videodev] vdec_open+0x1f4/0x788 [meson_vdec] v4l2_open+0x144/0x460 [videodev] chrdev_open+0x1ac/0x500 do_dentry_open+0x3f0/0xfe8 vfs_open+0x68/0x320 do_open+0x2d8/0x9a8 path_openat+0x1d0/0x4f0 do_filp_open+0x190/0x380 do_sys_openat2+0xf8/0x1b0 __arm64_sys_openat+0x13c/0x1e8 invoke_syscall+0xdc/0x268 el0_svc_common.constprop.0+0x178/0x258 do_el0_svc+0x4c/0x70 Cc: Nicolas Dufresne Reported-by: Sashiko Closes: https://lore.kernel.org/all/20260520045905.6ACBA1F000E9@smtp.kernel.org/#t Fixes: 3e7f51bd9607 ("media: meson: add v4l2 m2m video decoder driver") Signed-off-by: Anand Moon --- drivers/staging/media/meson/vdec/vdec.c | 33 ++++++++++++++----------- drivers/staging/media/meson/vdec/vdec.h | 4 +-- 2 files changed, 20 insertions(+), 17 deletions(-) diff --git a/drivers/staging/media/meson/vdec/vdec.c b/drivers/staging/media/meson/vdec/vdec.c index 4b77ec1af5a7..4ffebba2341d 100644 --- a/drivers/staging/media/meson/vdec/vdec.c +++ b/drivers/staging/media/meson/vdec/vdec.c @@ -153,7 +153,7 @@ static void vdec_m2m_job_abort(void *priv) { struct amvdec_session *sess = priv; - v4l2_m2m_job_finish(sess->m2m_dev, sess->m2m_ctx); + v4l2_m2m_job_finish(sess->core->m2m_dev, sess->m2m_ctx); } static const struct v4l2_m2m_ops vdec_m2m_ops = { @@ -873,23 +873,16 @@ static int vdec_open(struct file *file) sess->core = core; - sess->m2m_dev = v4l2_m2m_init(&vdec_m2m_ops); - if (IS_ERR(sess->m2m_dev)) { - dev_err(dev, "Fail to v4l2_m2m_init\n"); - ret = PTR_ERR(sess->m2m_dev); - goto err_free_sess; - } - - sess->m2m_ctx = v4l2_m2m_ctx_init(sess->m2m_dev, sess, m2m_queue_init); + sess->m2m_ctx = v4l2_m2m_ctx_init(core->m2m_dev, sess, m2m_queue_init); if (IS_ERR(sess->m2m_ctx)) { dev_err(dev, "Fail to v4l2_m2m_ctx_init\n"); ret = PTR_ERR(sess->m2m_ctx); - goto err_m2m_release; + goto err_fh_del; } ret = vdec_init_ctrls(sess); if (ret) - goto err_m2m_release; + goto err_free_sess; sess->pixfmt_cap = formats[0].pixfmts_cap[0]; sess->fmt_out = &formats[0]; @@ -913,8 +906,8 @@ static int vdec_open(struct file *file) return 0; -err_m2m_release: - v4l2_m2m_release(sess->m2m_dev); +err_fh_del: + v4l2_fh_exit(&sess->fh); err_free_sess: kfree(sess); return ret; @@ -925,9 +918,9 @@ static int vdec_close(struct file *file) struct amvdec_session *sess = file_to_amvdec_session(file); v4l2_m2m_ctx_release(sess->m2m_ctx); - v4l2_m2m_release(sess->m2m_dev); v4l2_fh_del(&sess->fh, file); v4l2_fh_exit(&sess->fh); + v4l2_ctrl_handler_free(&sess->ctrl_handler); mutex_destroy(&sess->lock); mutex_destroy(&sess->bufs_recycle_lock); @@ -1057,10 +1050,17 @@ static int vdec_probe(struct platform_device *pdev) if (ret) return ret; + core->m2m_dev = v4l2_m2m_init(&vdec_m2m_ops); + if (IS_ERR(core->m2m_dev)) { + dev_err(dev, "Failed to initialize v4l2 m2m device\n"); + return PTR_ERR(core->m2m_dev); + } + ret = v4l2_device_register(dev, &core->v4l2_dev); if (ret) { dev_err(dev, "Couldn't register v4l2 device\n"); - return -ENOMEM; + ret = -ENOMEM; + goto err_m2m_release; } vdev = video_device_alloc(); @@ -1095,6 +1095,8 @@ static int vdec_probe(struct platform_device *pdev) err_vdev_release: video_device_release(vdev); v4l2_device_unregister(&core->v4l2_dev); +err_m2m_release: + v4l2_m2m_release(core->m2m_dev); return ret; } @@ -1104,6 +1106,7 @@ static void vdec_remove(struct platform_device *pdev) video_unregister_device(core->vdev_dec); v4l2_device_unregister(&core->v4l2_dev); + v4l2_m2m_release(core->m2m_dev); } static struct platform_driver meson_vdec_driver = { diff --git a/drivers/staging/media/meson/vdec/vdec.h b/drivers/staging/media/meson/vdec/vdec.h index 7a5d8e871d70..cc0cfafb8a95 100644 --- a/drivers/staging/media/meson/vdec/vdec.h +++ b/drivers/staging/media/meson/vdec/vdec.h @@ -63,6 +63,7 @@ struct amvdec_session; * @vdec_hevcf_clk: VDEC_HEVCF clock * @esparser_reset: RESET for the PARSER * @vdev_dec: video device for the decoder + * @m2m_dev: v4l2 m2m device * @v4l2_dev: v4l2 device * @cur_sess: current decoding session * @lock: video device lock @@ -87,6 +88,7 @@ struct amvdec_core { struct reset_control *esparser_reset; struct video_device *vdev_dec; + struct v4l2_m2m_dev *m2m_dev; struct v4l2_device v4l2_dev; struct amvdec_session *cur_sess; @@ -183,7 +185,6 @@ enum amvdec_status { * * @core: reference to the vdec core struct * @fh: v4l2 file handle - * @m2m_dev: v4l2 m2m device * @m2m_ctx: v4l2 m2m context * @ctrl_handler: V4L2 control handler * @ctrl_min_buf_capture: V4L2 control V4L2_CID_MIN_BUFFERS_FOR_CAPTURE @@ -230,7 +231,6 @@ struct amvdec_session { struct amvdec_core *core; struct v4l2_fh fh; - struct v4l2_m2m_dev *m2m_dev; struct v4l2_m2m_ctx *m2m_ctx; struct v4l2_ctrl_handler ctrl_handler; struct v4l2_ctrl *ctrl_min_buf_capture; -- 2.50.1