ALSA: usb-audio: Add sanity checks for invalid EPs

USB-audio driver may set up a URB containing the fixed EP without
validating its presence for some non-class-compliant devices.  This
may end up with an oops-like kernel warning when submitted.

For avoiding it, this patch adds the call of the new sanity-check
helper for URBs.  The checks are needed only for MIDI I/O as the other
places have already some other checks.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 30 insertions, 8 deletions

diff --git a/sound/usb/midi.c b/sound/usb/midi.c
index a92e2b2a91ec..7ab25de5ca0a 100644
--- a/sound/usb/midi.c
+++ b/sound/usb/midi.c
@@ -1282,6 +1282,7 @@ static int snd_usbmidi_in_endpoint_create(struct snd_usb_midi *umidi,
         unsigned int pipe;
         int length;
         unsigned int i;
+        int err;
 
         rep->in = NULL;
         ep = kzalloc(sizeof(*ep), GFP_KERNEL);
@@ -1292,8 +1293,8 @@ static int snd_usbmidi_in_endpoint_create(struct snd_usb_midi *umidi,
         for (i = 0; i < INPUT_URBS; ++i) {
                 ep->urbs[i] = usb_alloc_urb(0, GFP_KERNEL);
                 if (!ep->urbs[i]) {
-                        snd_usbmidi_in_endpoint_delete(ep);
-                        return -ENOMEM;
+                        err = -ENOMEM;
+                        goto error;
                 }
         }
         if (ep_info->in_interval)
@@ -1305,8 +1306,8 @@ static int snd_usbmidi_in_endpoint_create(struct snd_usb_midi *umidi,
                 buffer = usb_alloc_coherent(umidi->dev, length, GFP_KERNEL,
                                             &ep->urbs[i]->transfer_dma);
                 if (!buffer) {
-                        snd_usbmidi_in_endpoint_delete(ep);
-                        return -ENOMEM;
+                        err = -ENOMEM;
+                        goto error;
                 }
                 if (ep_info->in_interval)
                         usb_fill_int_urb(ep->urbs[i], umidi->dev,
@@ -1318,10 +1319,20 @@ static int snd_usbmidi_in_endpoint_create(struct snd_usb_midi *umidi,
                                           pipe, buffer, length,
                                           snd_usbmidi_in_urb_complete, ep);
                 ep->urbs[i]->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
+                err = usb_urb_ep_type_check(ep->urbs[i]);
+                if (err < 0) {
+                        dev_err(&umidi->dev->dev, "invalid MIDI in EP %x\n",
+                                ep_info->in_ep);
+                        goto error;
+                }
         }
 
         rep->in = ep;
         return 0;
+
+ error:
+        snd_usbmidi_in_endpoint_delete(ep);
+        return -ENOMEM;
 }
 
 /*
@@ -1357,6 +1368,7 @@ static int snd_usbmidi_out_endpoint_create(struct snd_usb_midi *umidi,
         unsigned int i;
         unsigned int pipe;
         void *buffer;
+        int err;
 
         rep->out = NULL;
         ep = kzalloc(sizeof(*ep), GFP_KERNEL);
@@ -1367,8 +1379,8 @@ static int snd_usbmidi_out_endpoint_create(struct snd_usb_midi *umidi,
         for (i = 0; i < OUTPUT_URBS; ++i) {
                 ep->urbs[i].urb = usb_alloc_urb(0, GFP_KERNEL);
                 if (!ep->urbs[i].urb) {
-                        snd_usbmidi_out_endpoint_delete(ep);
-                        return -ENOMEM;
+                        err = -ENOMEM;
+                        goto error;
                 }
                 ep->urbs[i].ep = ep;
         }
@@ -1406,8 +1418,8 @@ static int snd_usbmidi_out_endpoint_create(struct snd_usb_midi *umidi,
                                             ep->max_transfer, GFP_KERNEL,
                                             &ep->urbs[i].urb->transfer_dma);
                 if (!buffer) {
-                        snd_usbmidi_out_endpoint_delete(ep);
-                        return -ENOMEM;
+                        err = -ENOMEM;
+                        goto error;
                 }
                 if (ep_info->out_interval)
                         usb_fill_int_urb(ep->urbs[i].urb, umidi->dev,
@@ -1419,6 +1431,12 @@ static int snd_usbmidi_out_endpoint_create(struct snd_usb_midi *umidi,
                                           pipe, buffer, ep->max_transfer,
                                           snd_usbmidi_out_urb_complete,
                                           &ep->urbs[i]);
+                err = usb_urb_ep_type_check(ep->urbs[i].urb);
+                if (err < 0) {
+                        dev_err(&umidi->dev->dev, "invalid MIDI out EP %x\n",
+                                ep_info->out_ep);
+                        goto error;
+                }
                 ep->urbs[i].urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
         }
 
@@ -1437,6 +1455,10 @@ static int snd_usbmidi_out_endpoint_create(struct snd_usb_midi *umidi,
 
         rep->out = ep;
         return 0;
+
+ error:
+        snd_usbmidi_out_endpoint_delete(ep);
+        return err;
 }
 
 /*