PWN-Hunter/android_kernel_xiaomi_sdm845
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[ALSA] Fix use after free in opl3_seq and opl3_oss

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Modules: OPL3

Don't read from free'd memory.  Also make use of the return
value, and don't register the device if something went wrong
creating the port.

Coverity #954, #955

Signed-off-by: Dave Jones <davej@redhat.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Dave Jones 2006-03-06 14:03:37 +01:00 committed by Jaroslav Kysela
parent 3de4414e79
commit 5e315e9248
2 changed files with 16 additions and 8 deletions
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12
sound/drivers/opl3/opl3_oss.c
View File

@ -104,8 +104,10 @@ static int snd_opl3_oss_create_port(struct snd_opl3 * opl3)
voices, voices,
name);
if (opl3->oss_chset->port < 0) {
int port;
port = opl3->oss_chset->port;
snd_midi_channel_free_set(opl3->oss_chset);
return opl3->oss_chset->port;
return port;
}
return 0;
}
@ -136,10 +138,10 @@ void snd_opl3_init_seq_oss(struct snd_opl3 *opl3, char *name)
arg->oper = oss_callback;
arg->private_data = opl3;
snd_opl3_oss_create_port(opl3);
/* register to OSS synth table */
snd_device_register(opl3->card, dev);
if (snd_opl3_oss_create_port(opl3)) {
/* register to OSS synth table */
snd_device_register(opl3->card, dev);
}
}
/* unregister */

12
sound/drivers/opl3/opl3_seq.c
View File

@ -207,8 +207,10 @@ static int snd_opl3_synth_create_port(struct snd_opl3 * opl3)
16, voices,
name);
if (opl3->chset->port < 0) {
int port;
port = opl3->chset->port;
snd_midi_channel_free_set(opl3->chset);
return opl3->chset->port;
return port;
}
return 0;
}
@ -218,7 +220,7 @@ static int snd_opl3_synth_create_port(struct snd_opl3 * opl3)
static int snd_opl3_seq_new_device(struct snd_seq_device *dev)
{
struct snd_opl3 *opl3;
int client;
int client, err;
char name[32];
int opl_ver;
@ -239,7 +241,11 @@ static int snd_opl3_seq_new_device(struct snd_seq_device *dev)
if (client < 0)
return client;
snd_opl3_synth_create_port(opl3);
if ((err = snd_opl3_synth_create_port(opl3)) < 0) {
snd_seq_delete_kernel_client(client);
opl3->seq_client = -1;
return err;
}
/* initialize instrument list */
opl3->ilist = snd_seq_instr_list_new();