ALSA: hda: Fix possible null-ptr-deref when assigning a stream

mainline inclusion
from mainline-v6.7-rc1
commit f93dc90c2e8ed664985e366aa6459ac83cdab236
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9RFHM
CVE: CVE-2023-52806

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=f93dc90c2e8ed664985e366aa6459ac83cdab236



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While AudioDSP drivers assign streams exclusively of HOST or LINK type,
nothing blocks a user to attempt to assign a COUPLED stream. As
supplied substream instance may be a stub, what is the case when
code-loading, such scenario ends with null-ptr-deref.

Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://lore.kernel.org/r/20231006102857.749143-2-cezary.rojewski@intel.com


Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Zeng Heng <zengheng4@huawei.com>