Dne 23. 12. 19 v 10:33 Takashi Sakamoto napsal(a):
A design of ALSA control core allows applications to execute three operations for TLV feature; read, write and command. Furthermore, it allows driver developers to process the operations by two ways; allocated array or callback function. In the former, read operation is just allowed, thus developers uses the latter when device driver supports variety of models or the target model is expected to dynamically change information stored in TLV container.
The core also allows applications to lock any element so that the other applications can't perform write operation to the element for element value and TLV information. When the element is locked, write and command operation for TLV information are prohibited as well as element value. Any read operation should be allowed in the case.
At present, when an element has callback function for TLV information, TLV read operation returns EPERM if the element is locked. On the other hand, the read operation is success when an element has allocated array for TLV information. In both cases, read operation is success for element value expectedly.
This commit fixes the bug. This change can be backported to v4.14 kernel or later.
sound/core/control.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/sound/core/control.c b/sound/core/control.c index 3fa1171dc1c2..49f3428dfacb 100644 --- a/sound/core/control.c +++ b/sound/core/control.c @@ -1398,8 +1398,9 @@ static int call_tlv_handler(struct snd_ctl_file *file, int op_flag, if (kctl->tlv.c == NULL) return -ENXIO;
- /* When locked, this is unavailable. */
- if (vd->owner != NULL && vd->owner != file)
// Write and command operations are not allowed for locked element.
if (op_flag != SNDRV_CTL_TLV_OP_READ &&
vd->owner != NULL && vd->owner != file)return -EPERM;
return kctl->tlv.c(kctl, op_flag, size, buf);
Thanks. Good catch. I would change only the comment back to /* */ to be consistent with the other sound/core code.
Reviewed-by: Jaroslav Kysela perex@perex.cz