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Fix bogus value when no user TLV is defined

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Check whether non-zero size TLV is really returned by comparing
with the pre-filled pattern.  ALSA 1.0.12 driver doesn't notify
the error even if user TLV is empty, so the previous value is
passed bogusly.
This commit is contained in:
Takashi Iwai 2006-08-25 11:43:22 +02:00
parent 042df4e80a
commit d5caee8d36
1 changed files with 14 additions and 1 deletions
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15
src/control/control.c
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@ -455,8 +455,21 @@ static int snd_ctl_tlv_do(snd_ctl_t *ctl, int op_flag,
int snd_ctl_elem_tlv_read(snd_ctl_t *ctl, const snd_ctl_elem_id_t *id,
unsigned int *tlv, unsigned int tlv_size)
{
int err;
assert(ctl && id && (id->name[0] || id->numid) && tlv);
return snd_ctl_tlv_do(ctl, 0, id, tlv, tlv_size);
if (tlv_size < 2 * sizeof(int))
return -EINVAL;
/* 1.0.12 driver doesn't return the error even if the user TLV
* is empty. So, initialize TLV here with an invalid type
* and compare the returned value after ioctl for checking
* the validity of TLV.
*/
tlv[0] = -1;
tlv[1] = 0;
err = snd_ctl_tlv_do(ctl, 0, id, tlv, tlv_size);
if (err >= 0 && tlv[0] == -1)
err = -ENXIO;
return err;
}
/**