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usb: gadget: f_midi: Fix memleak in f_midi_alloc 

In the error path, if midi is not null, we should
free the midi->id if necessary to prevent memleak.

Fixes: b85e9de9e8 ("usb: gadget: f_midi: convert to new function interface with backward compatibility")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Zhang Qilong <zhangqilong3@huawei.com>
Link: https://lore.kernel.org/r/20201117021629.1470544-2-zhangqilong3@huawei.com
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Zhang Qilong 2020-11-17 10:16:28 +08:00 committed by Greg Kroah-Hartman
parent 9ca5751836
commit e7694cb699
1 changed files with 7 additions and 3 deletions
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10
drivers/usb/gadget/function/f_midi.c
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@ -1315,7 +1315,7 @@ static struct usb_function *f_midi_alloc(struct usb_function_instance *fi)
midi->id = kstrdup(opts->id, GFP_KERNEL);
if (opts->id && !midi->id) {
status = -ENOMEM;
goto setup_fail;
goto midi_free;
}
midi->in_ports = opts->in_ports;
midi->out_ports = opts->out_ports;
@ -1327,7 +1327,7 @@ static struct usb_function *f_midi_alloc(struct usb_function_instance *fi)
status = kfifo_alloc(&midi->in_req_fifo, midi->qlen, GFP_KERNEL);
if (status)
goto setup_fail;
goto midi_free;
spin_lock_init(&midi->transmit_lock);
@ -1343,9 +1343,13 @@ static struct usb_function *f_midi_alloc(struct usb_function_instance *fi)
return &midi->func;
midi_free:
if (midi)
kfree(midi->id);
kfree(midi);
setup_fail:
mutex_unlock(&opts->lock);
kfree(midi);
return ERR_PTR(status);
}