| Message ID | 1461814941-28345-1-git-send-email-chunfeng.yun@mediatek.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
diff --git a/drivers/usb/core/buffer.c b/drivers/usb/core/buffer.c index 2741566..98e39f9 100644 --- a/drivers/usb/core/buffer.c +++ b/drivers/usb/core/buffer.c @@ -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 &&
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> --- drivers/usb/core/buffer.c | 3 +++ 1 file changed, 3 insertions(+)