Commits
Nicolin Chen committed 8053f21675b
ASoC: dapm: Add a dummy snd_pcm_runtime to avoid NULL pointer access The SND_SOC_DAPM_PRE_PMU case would call startup()/hw_params() that might access substream->runtime through other functions. For example: Unable to handle kernel NULL pointer dereference at virtual address [....] PC is at snd_pcm_hw_rule_add+0x24/0x1b0 LR is at snd_pcm_hw_constraint_list+0x20/0x28 [....] Process arecord (pid: 424, stack limit = 0xffffffc1ecaf0020) Call trace: [<ffffffc00086be68>] snd_pcm_hw_rule_add+0x24/0x1b0 [<ffffffc00086c014>] snd_pcm_hw_constraint_list+0x20/0x28 [<ffffffc0008b47a4>] cs53l30_pcm_startup+0x24/0x30 [<ffffffc0008a6260>] snd_soc_dai_link_event+0x290/0x354 [<ffffffc0008a7528>] dapm_seq_check_event.isra.31+0x134/0x2c8 [<ffffffc0008a7768>] dapm_seq_run_coalesced+0x94/0x1c8 [<ffffffc0008a7940>] dapm_seq_run+0xa4/0x404 [<ffffffc0008a8bac>] dapm_power_widgets+0x524/0x984 [<ffffffc0008ab1c4>] snd_soc_dapm_stream_event+0x8c/0xa8 [<ffffffc0008ac7f4>] soc_pcm_prepare+0x10c/0x1ec [<ffffffc000865b9c>] snd_pcm_do_prepare+0x1c/0x38 [<ffffffc000865600>] snd_pcm_action_single+0x40/0x88 [<ffffffc0008656b8>] snd_pcm_action_nonatomic+0x70/0x90 [<ffffffc000868d28>] snd_pcm_common_ioctl1+0xb6c/0xdd8 [<ffffffc000869508>] snd_pcm_capture_ioctl1+0x200/0x334 [<ffffffc00086a084>] snd_pcm_ioctl_compat+0x648/0x95c [<ffffffc0001ff4b4>] compat_SyS_ioctl+0xac/0xfc4 [<ffffffc000084cf0>] el0_svc_naked+0x24/0x28 ---[ end trace 0dc4f99c2759c35c ]--- So this patch adds a dummy runtime for the original dummy substream to merely avoid the NULL pointer access. Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>