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usb: core: buffer: avoid NULL pointer dereferrence

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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>
This commit is contained in:
Chunfeng Yun 2016-04-28 11:42:20 +08:00 committed by Greg Kroah-Hartman
parent b5a2a8ecb2
commit f5e6253fe6
1 changed files with 3 additions and 0 deletions
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3
drivers/usb/core/buffer.c
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@ -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 &&