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authorChunfeng Yun <chunfeng.yun@mediatek.com>2016-04-28 05:42:21 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-04-28 21:35:36 +0200
commit26186e5f2c1a6d1c244a3052f02e46ae29d823f2 (patch)
treef11ffd2e06d3e622175e24893917af145ead163f /drivers/usb/misc/usbtest.c
parentusb: core: buffer: avoid NULL pointer dereferrence (diff)
downloadlinux-26186e5f2c1a6d1c244a3052f02e46ae29d823f2.tar.xz
linux-26186e5f2c1a6d1c244a3052f02e46ae29d823f2.zip
usb: misc: usbtest: fix error of urb allocation
urb allocation will fail when usbtest_alloc_urb() tries to allocate zero length buffer, but it doesn't need it in fact, so just skips buffer allocation in the case. Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/misc/usbtest.c')
-rw-r--r--drivers/usb/misc/usbtest.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/usb/misc/usbtest.c b/drivers/usb/misc/usbtest.c
index 92fdb6e9faff..de485d8a5beb 100644
--- a/drivers/usb/misc/usbtest.c
+++ b/drivers/usb/misc/usbtest.c
@@ -287,6 +287,9 @@ static struct urb *usbtest_alloc_urb(
if (usb_pipein(pipe))
urb->transfer_flags |= URB_SHORT_NOT_OK;
+ if ((bytes + offset) == 0)
+ return urb;
+
if (urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)
urb->transfer_buffer = usb_alloc_coherent(udev, bytes + offset,
GFP_KERNEL, &urb->transfer_dma);