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: Chunfeng Yun <chunfeng.yun@mediatek.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -122,6 +122,9 @@ void *hcd_buffer_alloc(
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struct usb_hcd *hcd = bus_to_hcd(bus);
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int i;
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if (size == 0)
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return NULL;
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/* some USB hosts just use PIO */
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if (!IS_ENABLED(CONFIG_HAS_DMA) ||
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(!bus->controller->dma_mask &&
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