From: Chunfeng Yun <chunfeng.yun@mediatek.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Chunfeng Yun <chunfeng.yun@mediatek.com>,
<linux-kernel@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-usb@vger.kernel.org>, <linux-mediatek@lists.infradead.org>,
Felipe Balbi <felipe.balbi@linux.intel.com>,
Alan Stern <stern@rowland.harvard.edu>
Subject: [PATCH v2 1/2] usb: core: buffer: avoid NULL pointer dereferrence
Date: Thu, 28 Apr 2016 11:42:20 +0800 [thread overview]
Message-ID: <1461814941-28345-1-git-send-email-chunfeng.yun@mediatek.com> (raw)
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(+)
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 &&
--
1.7.9.5
next reply other threads:[~2016-04-28 3:42 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-28 3:42 Chunfeng Yun [this message]
2016-04-28 3:42 ` [PATCH v2 2/2] usb: misc: usbtest: fix error of urb allocation Chunfeng Yun
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