usb: gadget: f_midi: check kstrdup() return value

kstrdup() might fail, so check its return value and react appropriately.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/gadget/function/f_midi.c b/drivers/usb/gadget/function/f_midi.c
index bf329578c95713c589bd1e763b66c6976e0c2c50..a920eee9e8784ed4d5fe5173f573d23f8ffeba01 100644 (file)
--- a/drivers/usb/gadget/function/f_midi.c
+++ b/drivers/usb/gadget/function/f_midi.c
@@ -654,6 +654,14 @@ static struct snd_rawmidi_ops gmidi_out_ops = {
        .trigger = f_midi_out_trigger
 };
 
+static inline void f_midi_unregister_card(struct f_midi *midi)
+{
+       if (midi->card) {
+               snd_card_free(midi->card);
+               midi->card = NULL;
+       }
+}
+
 /* register as a sound "card" */
 static int f_midi_register_card(struct f_midi *midi)
 {
@@ -715,10 +723,7 @@ static int f_midi_register_card(struct f_midi *midi)
        return 0;
 
 fail:
-       if (midi->card) {
-               snd_card_free(midi->card);
-               midi->card = NULL;
-       }
+       f_midi_unregister_card(midi);
        return err;
 }
 
@@ -967,15 +972,23 @@ int __init f_midi_bind_config(struct usb_configuration *c,
        midi->func.disable     = f_midi_disable;
 
        midi->id = kstrdup(id, GFP_KERNEL);
+       if (id && !midi->id) {
+               status = -ENOMEM;
+               goto kstrdup_fail;
+       }
        midi->buflen = buflen;
        midi->qlen = qlen;
 
        status = usb_add_function(c, &midi->func);
        if (status)
-               goto setup_fail;
+               goto add_fail;
 
        return 0;
 
+add_fail:
+       kfree(midi->id);
+kstrdup_fail:
+       f_midi_unregister_card(midi);
 setup_fail:
        for (--i; i >= 0; i--)
                kfree(midi->in_port[i]);