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Mon, 13 Jul 2026 05:11:10 -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 , 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 , Doruk Tan Ozturk , Nicolas Dufresne Subject: [PATCH v7 13/19] media: meson: vdec: Fix race conditions in job abort sequence Date: Mon, 13 Jul 2026 17:37:08 +0530 Message-ID: <20260713120840.17427-14-linux.amoon@gmail.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20260713120840.17427-1-linux.amoon@gmail.com> References: <20260713120840.17427-1-linux.amoon@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Implement proper cleanup inside vdec_m2m_job_abort to safely stop the hardware job sequence during a streaming abort or teardown. Without this, if a job is aborted right after being triggered, the deferred work item (esparser_queue_work) scheduled by device_run could continue running concurrently. This leads to unexpected behavior and potential use-after-free bugs if session structures are cleared. Fix this by flagging the session to stop via WRITE_ONCE, synchronously canceling any pending parser work, and safely clearing the active core session pointer under the core lock protection. Cc: Nicolas Dufresne Signed-off-by: Anand Moon --- drivers/staging/media/meson/vdec/vdec.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/staging/media/meson/vdec/vdec.c b/drivers/staging/media/meson/vdec/vdec.c index b3e1d99e8889f..ac86a9c4febff 100644 --- a/drivers/staging/media/meson/vdec/vdec.c +++ b/drivers/staging/media/meson/vdec/vdec.c @@ -167,6 +167,17 @@ static void vdec_m2m_device_run(void *priv) static void vdec_m2m_job_abort(void *priv) { struct amvdec_session *sess = priv; + struct amvdec_core *core = sess->core; + + WRITE_ONCE(sess->should_stop, 1); + + cancel_work_sync(&sess->esparser_queue_work); + + mutex_lock(&core->lock); + if (core->cur_sess == sess) + /* Safely clear hardware ownership since we were confirmed as the owner */ + smp_store_release(&core->cur_sess, NULL); + mutex_unlock(&core->lock); v4l2_m2m_job_finish(sess->core->m2m_dev, sess->m2m_ctx); } -- 2.50.1