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Commit f5e6253f authored by Chunfeng Yun's avatar Chunfeng Yun Committed by Greg Kroah-Hartman
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usb: core: buffer: avoid NULL pointer dereferrence 



NULL pointer dereferrence will happen when class driver
wants to allocate zero length buffer and pool_max[0]
can't be used, so simply returns NULL in the case.

Signed-off-by: default avatarChunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent b5a2a8ec

drivers/usb/core/buffer.c

+3 −0
Original line number Diff line number Diff line
@@ -122,6 +122,9 @@ void *hcd_buffer_alloc( 
	struct usb_hcd		*hcd = bus_to_hcd(bus);

	int			i;



	if (size == 0)

		return NULL;



	/* some USB hosts just use PIO */

	if (!IS_ENABLED(CONFIG_HAS_DMA) ||

	    (!bus->controller->dma_mask &&