From: Kai Vehmanen Date: Thu, 4 Jul 2024 08:57:08 +0000 (+0200) Subject: ASoC: SOF: Intel: hda: fix null deref on system suspend entry X-Git-Tag: v6.10~15^2^2~3 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=9065693dcc13f287b9e4991f43aee70cf5538fdd;p=thirdparty%2Fkernel%2Flinux.git ASoC: SOF: Intel: hda: fix null deref on system suspend entry When system enters suspend with an active stream, SOF core calls hw_params_upon_resume(). On Intel platforms with HDA DMA used to manage the link DMA, this leads to call chain of hda_dsp_set_hw_params_upon_resume() -> hda_dsp_dais_suspend() -> hda_dai_suspend() -> hda_ipc4_post_trigger() A bug is hit in hda_dai_suspend() as hda_link_dma_cleanup() is run first, which clears hext_stream->link_substream, and then hda_ipc4_post_trigger() is called with a NULL snd_pcm_substream pointer. Fixes: 2b009fa0823c ("ASoC: SOF: Intel: hda: Unify DAI drv ops for IPC3 and IPC4") Link: https://github.com/thesofproject/linux/issues/5080 Reviewed-by: Bard Liao Signed-off-by: Kai Vehmanen Signed-off-by: Pierre-Louis Bossart Link: https://patch.msgid.link/20240704085708.371414-1-pierre-louis.bossart@linux.intel.com Signed-off-by: Mark Brown --- diff --git a/sound/soc/sof/intel/hda-dai.c b/sound/soc/sof/intel/hda-dai.c index c61d298ea6b3a..1c823f9eea570 100644 --- a/sound/soc/sof/intel/hda-dai.c +++ b/sound/soc/sof/intel/hda-dai.c @@ -617,12 +617,6 @@ static int hda_dai_suspend(struct hdac_bus *bus) sdai = swidget->private; ops = sdai->platform_private; - ret = hda_link_dma_cleanup(hext_stream->link_substream, - hext_stream, - cpu_dai); - if (ret < 0) - return ret; - /* for consistency with TRIGGER_SUSPEND */ if (ops->post_trigger) { ret = ops->post_trigger(sdev, cpu_dai, @@ -631,6 +625,12 @@ static int hda_dai_suspend(struct hdac_bus *bus) if (ret < 0) return ret; } + + ret = hda_link_dma_cleanup(hext_stream->link_substream, + hext_stream, + cpu_dai); + if (ret < 0) + return ret; } }