@@ -265,7 +265,7 @@ static void free_midi_urbs(struct snd_usb_midi2_endpoint *ep)
if (!ep)
return;
- for (i = 0; i < ep->num_urbs; ++i) {
+ for (i = 0; i < NUM_URBS; ++i) {
ctx = &ep->urbs[i];
if (!ctx->urb)
break;
@@ -279,6 +279,7 @@ static void free_midi_urbs(struct snd_usb_midi2_endpoint *ep)
}
/* allocate URBs for an EP */
+/* the callers should handle allocation errors via free_midi_urbs() */
static int alloc_midi_urbs(struct snd_usb_midi2_endpoint *ep)
{
struct snd_usb_midi2_urb *ctx;
@@ -351,8 +352,10 @@ static int snd_usb_midi_v2_open(struct snd_ump_endpoint *ump, int dir)
return -EIO;
if (ep->direction == STR_OUT) {
err = alloc_midi_urbs(ep);
- if (err)
+ if (err) {
+ free_midi_urbs(ep);
return err;
+ }
}
return 0;
}
The allocation and initialization errors at alloc_midi_urbs() that is called at MIDI 2.0 / UMP device are supposed to be handled at the caller side by invoking free_midi_urbs(). However, free_midi_urbs() loops only for ep->num_urbs entries, and since ep->num_entries wasn't updated yet at the allocation / init error in alloc_midi_urbs(), this entry won't be released. The intention of free_midi_urbs() is to release the whole elements, so change the loop size to NUM_URBS to scan over all elements for fixing the missed releases. Also, the call of free_midi_urbs() is missing at snd_usb_midi_v2_open(). Although it'll be released later at reopen/close or disconnection, it's better to release immediately at the error path. Fixes: ff49d1df79ae ("ALSA: usb-audio: USB MIDI 2.0 UMP support") Reported-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> Closes: https://lore.kernel.org/r/fc275ed315b9157952dcf2744ee7bdb78defdb5f.1693746347.git.christophe.jaillet@wanadoo.fr Signed-off-by: Takashi Iwai <tiwai@suse.de> --- sound/usb/midi2.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)