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Sat, 30 May 2026 02:44:31 -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 3/8] media: meson: vdec: Handle kthread failure and free codec state Date: Sat, 30 May 2026 15:12:49 +0530 Message-ID: <20260530094326.11892-4-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-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit vdec_start_streaming() launches a recycle thread when required by the codec. If kthread_run() fails, the previous error path only powered off the hardware, leaving sess->priv and codec state allocated. This caused a permanent leak of the codec context and associated DMA buffers. Fix this by introducing a dedicated err_cleanup path: - Call codec_ops->stop() to release the codec context and clear sess->priv. - Power off the hardware before freeing buffers to avoid DMA faults. - Free canvas IDs explicitly and set sess->vififo_vaddr = NULL after dma_free_coherent() to guard against double‑free in fallback stop paths. - Reset core->cur_sess and sess->status to prevent stale references. Following change closes the memory leak on kthread_run() failure and ensures robust cleanup of codec resources in both error and stop paths. Cc: Nicolas Dufresne Reported-by: Sashiko Closes: https://lore.kernel.org/all/20260521090944.F35401F00A3D@smtp.kernel.org/ Fixes: 3e7f51bd9607 ("media: meson: add v4l2 m2m video decoder driver") Signed-off-by: Anand Moon --- drivers/staging/media/meson/vdec/vdec.c | 26 ++++++++++++++++++++++--- 1 file changed, 23 insertions(+), 3 deletions(-) diff --git a/drivers/staging/media/meson/vdec/vdec.c b/drivers/staging/media/meson/vdec/vdec.c index 7233000e2232..8a5bf1a96830 100644 --- a/drivers/staging/media/meson/vdec/vdec.c +++ b/drivers/staging/media/meson/vdec/vdec.c @@ -32,6 +32,8 @@ struct dummy_buf { /* 16 MiB for parsed bitstream swap exchange */ #define SIZE_VIFIFO SZ_16M +static void vdec_free_canvas(struct amvdec_session *sess); + static u32 get_output_size(u32 width, u32 height) { return ALIGN(width * height, SZ_64K); @@ -352,16 +354,31 @@ static int vdec_start_streaming(struct vb2_queue *q, unsigned int count) sess->sequence_cap = 0; sess->sequence_out = 0; - if (vdec_codec_needs_recycle(sess)) + if (vdec_codec_needs_recycle(sess)) { sess->recycle_thread = kthread_run(vdec_recycle_thread, sess, "vdec_recycle"); + if (IS_ERR(sess->recycle_thread)) { + ret = PTR_ERR(sess->recycle_thread); + sess->recycle_thread = NULL; + goto err_cleanup; + } + } schedule_work(&sess->esparser_queue_work); return 0; +err_cleanup: + vdec_free_canvas(sess); + vdec_poweroff(sess); + if (codec_ops && codec_ops->stop && sess->priv) { + codec_ops->stop(sess); + kfree(sess->priv); + sess->priv = NULL; + } vififo_free: dma_free_coherent(sess->core->dev, sess->vififo_size, sess->vififo_vaddr, sess->vififo_paddr); + sess->vififo_vaddr = NULL; bufs_done: mutex_lock(&core->lock); if (core->cur_sess == sess) @@ -441,8 +458,11 @@ static void vdec_stop_streaming(struct vb2_queue *q) vdec_poweroff(sess); vdec_free_canvas(sess); - dma_free_coherent(sess->core->dev, sess->vififo_size, - sess->vififo_vaddr, sess->vififo_paddr); + if (sess->vififo_vaddr) { + dma_free_coherent(sess->core->dev, sess->vififo_size, + sess->vififo_vaddr, + sess->vififo_paddr); + } vdec_reset_timestamps(sess); vdec_reset_bufs_recycle(sess); kfree(sess->priv); -- 2.50.1