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authorKai Vehmanen <kai.vehmanen@linux.intel.com>2019-12-17 18:05:16 -0600
committerMark Brown <broonie@kernel.org>2019-12-18 19:49:22 +0000
commitb06e46427f987bf83dcb6a69516b57276eb8ec0c (patch)
treed1ce39c279d0a353b9d40f447553012b4cdae5e0 /sound/soc/sof/ipc.c
parent556672d75ff486e0b6786056da624131679e0576 (diff)
ASoC: SOF: fix fault at driver unload after failed probe
If sof_machine_check() fails during driver probe, the IPC state is not initialized and this will lead to a NULL dereference at driver unload. Example log is as follows: [ 1535.980630] sof-audio-pci 0000:00:1f.3: error: no matching ASoC machine driver found - aborting probe [ 1535.980631] sof-audio-pci 0000:00:1f.3: error: failed to get machine info -19 [ 1535.980632] sof-audio-pci 0000:00:1f.3: error: sof_probe_work failed err: -19 [ 1550.798373] BUG: kernel NULL pointer dereference, address: 0000000000000008 ... [ 1550.798393] Call Trace: [ 1550.798397] snd_sof_ipc_free+0x15/0x30 [snd_sof] [ 1550.798399] snd_sof_device_remove+0x29/0xa0 [snd_sof] [ 1550.798400] sof_pci_remove+0x10/0x30 [snd_sof_pci] Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Link: https://lore.kernel.org/r/20191218000518.5830-2-pierre-louis.bossart@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/soc/sof/ipc.c')
-rw-r--r--sound/soc/sof/ipc.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/sound/soc/sof/ipc.c b/sound/soc/sof/ipc.c
index 5994e1073364..5fdfbaa8c4ed 100644
--- a/sound/soc/sof/ipc.c
+++ b/sound/soc/sof/ipc.c
@@ -826,6 +826,9 @@ void snd_sof_ipc_free(struct snd_sof_dev *sdev)
{
struct snd_sof_ipc *ipc = sdev->ipc;
+ if (!ipc)
+ return;
+
/* disable sending of ipc's */
mutex_lock(&ipc->tx_mutex);
ipc->disable_ipc_tx = true;