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Subject[PATCH 5.9 143/152] usb: gadget: f_midi: Fix memleak in f_midi_alloc
Date
From: Zhang Qilong <zhangqilong3@huawei.com>

commit e7694cb6998379341fd9bf3bd62b48c4e6a79385 upstream.

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

Fixes: b85e9de9e818d ("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>

---
drivers/usb/gadget/function/f_midi.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)

--- a/drivers/usb/gadget/function/f_midi.c
+++ b/drivers/usb/gadget/function/f_midi.c
@@ -1315,7 +1315,7 @@ static struct usb_function *f_midi_alloc
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

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

return &midi->func;

+midi_free:
+ if (midi)
+ kfree(midi->id);
+ kfree(midi);
setup_fail:
mutex_unlock(&opts->lock);
- kfree(midi);
+
return ERR_PTR(status);
}


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