diff options
| author | Nadezda Lutovinova <lutovinova@ispras.ru> | 2021-08-18 17:12:47 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-08-18 16:42:09 +0200 |
| commit | 2af0c5ffadaf9d13eca28409d4238b4e672942d3 (patch) | |
| tree | 52a7660484dbb0943731e8cec9365b29b79d37ee /drivers/usb/gadget/udc/mv_u3d_core.c | |
| parent | 1bc220835526ae076eecfb7ed513f80f22cf840d (diff) | |
usb: gadget: mv_u3d: request_irq() after initializing UDC
If IRQ occurs between calling request_irq() and mv_u3d_eps_init(),
then null pointer dereference occurs since u3d->eps[] wasn't
initialized yet but used in mv_u3d_nuke().
The patch puts registration of the interrupt handler after
initializing of neccesery data.
Found by Linux Driver Verification project (linuxtesting.org).
Fixes: 90fccb529d24 ("usb: gadget: Gadget directory cleanup - group UDC drivers")
Acked-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Nadezda Lutovinova <lutovinova@ispras.ru>
Link: https://lore.kernel.org/r/20210818141247.4794-1-lutovinova@ispras.ru
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/gadget/udc/mv_u3d_core.c')
| -rw-r--r-- | drivers/usb/gadget/udc/mv_u3d_core.c | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/drivers/usb/gadget/udc/mv_u3d_core.c b/drivers/usb/gadget/udc/mv_u3d_core.c index ce3d7a3eb7e3..a1057ddfbda3 100644 --- a/drivers/usb/gadget/udc/mv_u3d_core.c +++ b/drivers/usb/gadget/udc/mv_u3d_core.c @@ -1921,14 +1921,6 @@ static int mv_u3d_probe(struct platform_device *dev) goto err_get_irq; } u3d->irq = r->start; - if (request_irq(u3d->irq, mv_u3d_irq, - IRQF_SHARED, driver_name, u3d)) { - u3d->irq = 0; - dev_err(&dev->dev, "Request irq %d for u3d failed\n", - u3d->irq); - retval = -ENODEV; - goto err_request_irq; - } /* initialize gadget structure */ u3d->gadget.ops = &mv_u3d_ops; /* usb_gadget_ops */ @@ -1941,6 +1933,15 @@ static int mv_u3d_probe(struct platform_device *dev) mv_u3d_eps_init(u3d); + if (request_irq(u3d->irq, mv_u3d_irq, + IRQF_SHARED, driver_name, u3d)) { + u3d->irq = 0; + dev_err(&dev->dev, "Request irq %d for u3d failed\n", + u3d->irq); + retval = -ENODEV; + goto err_request_irq; + } + /* external vbus detection */ if (u3d->vbus) { u3d->clock_gating = 1; @@ -1964,8 +1965,8 @@ static int mv_u3d_probe(struct platform_device *dev) err_unregister: free_irq(u3d->irq, u3d); -err_request_irq: err_get_irq: +err_request_irq: kfree(u3d->status_req); err_alloc_status_req: kfree(u3d->eps); |