[PATCH] usb : musb : Fix null pointer dereference issue

[Maulik Mankad <x0082077@xxxxxx>]

This patch fixes the following NULL pointer dereference issue.

Pointer 'request' returned from call to function 'next_request'
at line 748 may be NULL and may be dereferenced at line 792.

============
Code Snippet
============

748:  request = next_request(musb_ep);
785: if (dma && (csr & MUSB_RXCSR_DMAENAB)) {
	csr &= ~(MUSB_RXCSR_AUTOCLEAR
			| MUSB_RXCSR_DMAENAB
			| MUSB_RXCSR_DMAMODE);
	musb_writew(epio, MUSB_RXCSR,
		MUSB_RXCSR_P_WZC_BITS | csr);

792:	 request->actual += musb_ep->dma->actual_len;
		

Signed-off-by: Maulik Mankad <x0082077@xxxxxx>

Index: linux-2.6/drivers/usb/musb/musb_gadget.c
===================================================================
--- linux-2.6.orig/drivers/usb/musb/musb_gadget.c
+++ linux-2.6/drivers/usb/musb/musb_gadget.c
@@ -746,6 +746,8 @@ void musb_g_rx(struct musb *musb, u8 epn
 	musb_ep_select(mbase, epnum);
 
 	request = next_request(musb_ep);
+	if (!request)
+		return;
 
 	csr = musb_readw(epio, MUSB_RXCSR);
 	dma = is_dma_capable() ? musb_ep->dma : NULL;
--
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