ASoC: SOF: Intel: Fix NULL ptr dereference when ENOMEM

commit b7fb0ae 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 <[email protected]>
Cc: Jaroslav Kysela <[email protected]>
Cc: Kai Vehmanen <[email protected]>
Cc: Keyon Jie <[email protected]>
Cc: Liam Girdwood <[email protected]>
Cc: Mark Brown <[email protected]>
Cc: Rander Wang <[email protected]>
Cc: Ranjani Sridharan <[email protected]>
Cc: Takashi Iwai <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected] # v5.2+
Fixes: d16046f ("ASoC: SOF: Intel: Add Intel specific HDA firmware loader")
Link: https://lore.kernel.org/lkml/[email protected]/ # v1
Link: https://lore.kernel.org/lkml/[email protected]/ # v2
Link: https://lore.kernel.org/lkml/[email protected]/ # v3
Reviewed-by: Peter Ujfalusi <[email protected]>
Reviewed-by: Pierre-Louis Bossart <[email protected]>
Signed-off-by: Ammar Faizi <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>
[ammarfaizi2: Backport to Linux 5.4 LTS]
Signed-off-by: Ammar Faizi <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

sound/soc/sof/intel/hda-loader.c

@@ -50,7 +50,7 @@ static int cl_stream_prepare(struct snd_sof_dev *sdev, unsigned int format,
 	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: %x\n", ret);
-		goto error;
+		goto out_put;
 	}
 
 	hstream->period_bytes = 0;/* initialize period_bytes */
@@ -60,16 +60,17 @@ static int cl_stream_prepare(struct snd_sof_dev *sdev, unsigned int format,
 	ret = hda_dsp_stream_hw_params(sdev, dsp_stream, dmab, NULL);
 	if (ret < 0) {
 		dev_err(sdev->dev, "error: hdac prepare failed: %x\n", ret);
-		goto error;
+		goto out_free;
 	}
 
 	hda_dsp_stream_spib_config(sdev, dsp_stream, HDA_DSP_SPIB_ENABLE, size);
 
 	return hstream->stream_tag;
 
-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 ret;
 }