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authorDave Jones <davej@redhat.com>2006-12-15 00:39:00 +0100
committerAdrian Bunk <bunk@stusta.de>2006-12-15 00:39:00 +0100
commit6f6c1475b6083f4d3ae4e0325084ff6631389ca6 (patch)
tree21467c4dc34a1743898112f7ba1f65e674e33651 /sound
parent79bb71477142dd104a27a37bef36c1b1c4bbba43 (diff)
[ALSA] Fix use after free in opl3_seq and opl3_oss
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: Adrian Bunk <bunk@stusta.de>
Diffstat (limited to 'sound')
-rw-r--r--sound/drivers/opl3/opl3_oss.c12
-rw-r--r--sound/drivers/opl3/opl3_seq.c12
2 files changed, 16 insertions, 8 deletions
diff --git a/sound/drivers/opl3/opl3_oss.c b/sound/drivers/opl3/opl3_oss.c
index 0345ae647681..fccf019a6d85 100644
--- a/sound/drivers/opl3/opl3_oss.c
+++ b/sound/drivers/opl3/opl3_oss.c
@@ -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 */
diff --git a/sound/drivers/opl3/opl3_seq.c b/sound/drivers/opl3/opl3_seq.c
index c4ead790008a..56b1d1a964a9 100644
--- a/sound/drivers/opl3/opl3_seq.c
+++ b/sound/drivers/opl3/opl3_seq.c
@@ -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();