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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Daniel Baluta <daniel.baluta@nxp.com>,
        Jaroslav Kysela <perex@perex.cz>,
        Kai Vehmanen <kai.vehmanen@linux.intel.com>,
        Keyon Jie <yang.jie@linux.intel.com>,
        Liam Girdwood <lgirdwood@gmail.com>,
        Mark Brown <broonie@kernel.org>,
        Rander Wang <rander.wang@intel.com>,
        Ranjani Sridharan <ranjani.sridharan@linux.intel.com>,
        Takashi Iwai <tiwai@suse.com>,
        sound-open-firmware@alsa-project.org, alsa-devel@alsa-project.org,
        Peter Ujfalusi <peter.ujfalusi@linux.intel.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>,
        Ammar Faizi <ammarfaizi2@gnuweeb.org>
Subject: [PATCH 5.16 0134/1017] ASoC: SOF: Intel: Fix NULL ptr dereference when ENOMEM
Date:   Tue,  5 Apr 2022 09:17:27 +0200
Message-Id: <20220405070358.179697571@linuxfoundation.org>
In-Reply-To: <20220405070354.155796697@linuxfoundation.org>
References: <20220405070354.155796697@linuxfoundation.org>
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From: Ammar Faizi <ammarfaizi2@gnuweeb.org>

commit b7fb0ae09009d076964afe4c1a2bde1ee2bd88a9 upstream.

Do not call snd_dma_free_pages() when snd_dma_alloc_pages() returns
-ENOMEM because it leads to a NULL pointer dereference bug.

The dmesg says:

  [ T1387] sof-audio-pci-intel-tgl 0000:00:1f.3: error: memory alloc failed: -12
  [ T1387] BUG: kernel NULL pointer dereference, address: 0000000000000000
  [ T1387] #PF: supervisor read access in kernel mode
  [ T1387] #PF: error_code(0x0000) - not-present page
  [ T1387] PGD 0 P4D 0
  [ T1387] Oops: 0000 [#1] PREEMPT SMP NOPTI
  [ T1387] CPU: 6 PID: 1387 Comm: alsa-sink-HDA A Tainted: G        W         5.17.0-rc4-superb-owl-00055-g80d47f5de5e3
  [ T1387] Hardware name: HP HP Laptop 14s-dq2xxx/87FD, BIOS F.15 09/15/2021
  [ T1387] RIP: 0010:dma_free_noncontiguous+0x37/0x80
  [ T1387] Code: [... snip ...]
  [ T1387] RSP: 0000:ffffc90002b87770 EFLAGS: 00010246
  [ T1387] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
  [ T1387] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888101db30d0
  [ T1387] RBP: 00000000fffffff4 R08: 0000000000000000 R09: 0000000000000000
  [ T1387] R10: 0000000000000000 R11: ffffc90002b874d0 R12: 0000000000000001
  [ T1387] R13: 0000000000058000 R14: ffff888105260c68 R15: ffff888105260828
  [ T1387] FS:  00007f42e2ffd640(0000) GS:ffff888466b80000(0000) knlGS:0000000000000000
  [ T1387] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [ T1387] CR2: 0000000000000000 CR3: 000000014acf0003 CR4: 0000000000770ee0
  [ T1387] PKRU: 55555554
  [ T1387] Call Trace:
  [ T1387]  <TASK>
  [ T1387]  cl_stream_prepare+0x10a/0x120 [snd_sof_intel_hda_common 146addf995b9279ae7f509621078cccbe4f875e1]
  [... snip ...]
  [ T1387]  </TASK>

Cc: Daniel Baluta <daniel.baluta@nxp.com>
Cc: Jaroslav Kysela <perex@perex.cz>
Cc: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Cc: Keyon Jie <yang.jie@linux.intel.com>
Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Rander Wang <rander.wang@intel.com>
Cc: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Cc: Takashi Iwai <tiwai@suse.com>
Cc: sound-open-firmware@alsa-project.org
Cc: alsa-devel@alsa-project.org
Cc: linux-kernel@vger.kernel.org
Cc: stable@vger.kernel.org # v5.2+
Fixes: d16046ffa6de040bf580a64d5f4d0aa18258a854 ("ASoC: SOF: Intel: Add Intel specific HDA firmware loader")
Link: https://lore.kernel.org/lkml/20220224145124.15985-1-ammarfaizi2@gnuweeb.org/ # v1
Link: https://lore.kernel.org/lkml/20220224180850.34592-1-ammarfaizi2@gnuweeb.org/ # v2
Link: https://lore.kernel.org/lkml/20220224182818.40301-1-ammarfaizi2@gnuweeb.org/ # v3
Reviewed-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Ammar Faizi <ammarfaizi2@gnuweeb.org>
Link: https://lore.kernel.org/r/20220224185836.44907-1-ammarfaizi2@gnuweeb.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 sound/soc/sof/intel/hda-loader.c |   11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

--- a/sound/soc/sof/intel/hda-loader.c
+++ b/sound/soc/sof/intel/hda-loader.c
@@ -48,7 +48,7 @@ static struct hdac_ext_stream *cl_stream
 	ret = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV_SG, &pci->dev, size, dmab);
 	if (ret < 0) {
 		dev_err(sdev->dev, "error: memory alloc failed: %d\n", ret);
-		goto error;
+		goto out_put;
 	}
 
 	hstream->period_bytes = 0;/* initialize period_bytes */
@@ -59,22 +59,23 @@ static struct hdac_ext_stream *cl_stream
 		ret = hda_dsp_iccmax_stream_hw_params(sdev, dsp_stream, dmab, NULL);
 		if (ret < 0) {
 			dev_err(sdev->dev, "error: iccmax stream prepare failed: %d\n", ret);
-			goto error;
+			goto out_free;
 		}
 	} else {
 		ret = hda_dsp_stream_hw_params(sdev, dsp_stream, dmab, NULL);
 		if (ret < 0) {
 			dev_err(sdev->dev, "error: hdac prepare failed: %d\n", ret);
-			goto error;
+			goto out_free;
 		}
 		hda_dsp_stream_spib_config(sdev, dsp_stream, HDA_DSP_SPIB_ENABLE, size);
 	}
 
 	return dsp_stream;
 
-error:
-	hda_dsp_stream_put(sdev, direction, hstream->stream_tag);
+out_free:
 	snd_dma_free_pages(dmab);
+out_put:
+	hda_dsp_stream_put(sdev, direction, hstream->stream_tag);
 	return ERR_PTR(ret);
 }