From: Rui Miguel Silva <rui.silva@linaro.org>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Alan Stern <stern@rowland.harvard.edu>
Cc: linux-usb@vger.kernel.org, Rui Miguel Silva <rui.silva@linaro.org>
Subject: [PATCH 2/5] usb: isp1760: check maxpacketsize before using it
Date: Thu, 19 Aug 2021 19:09:26 +0100 [thread overview]
Message-ID: <20210819180929.1327349-3-rui.silva@linaro.org> (raw)
In-Reply-To: <20210819180929.1327349-1-rui.silva@linaro.org>
When checking if we need one more packet on a bulk pipe we may, even
though not probable at all, get there with a zero maxpacketsize.
In that case for sure no packet, no even a one more, will be
allocated.
This will clean the clang-analyzer warning:
drivers/usb/isp1760/isp1760-hcd.c:1856:38: warning: Division by zero [clang-analyzer-core.DivideZero]
&& !(urb->transfer_buffer_length %
Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
---
drivers/usb/isp1760/isp1760-hcd.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/usb/isp1760/isp1760-hcd.c b/drivers/usb/isp1760/isp1760-hcd.c
index 2a21fe5aa7a8..5c947a1eae49 100644
--- a/drivers/usb/isp1760/isp1760-hcd.c
+++ b/drivers/usb/isp1760/isp1760-hcd.c
@@ -1854,7 +1854,7 @@ static void packetize_urb(struct usb_hcd *hcd,
packet_type = OUT_PID;
else
packet_type = IN_PID;
- } else if (usb_pipebulk(urb->pipe)
+ } else if (usb_pipebulk(urb->pipe) && maxpacketsize
&& (urb->transfer_flags & URB_ZERO_PACKET)
&& !(urb->transfer_buffer_length %
maxpacketsize)) {
--
2.33.0
next prev parent reply other threads:[~2021-08-19 18:09 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-19 18:09 [PATCH 0/5] usb: isp1760: clang analyzer fixes Rui Miguel Silva
2021-08-19 18:09 ` [PATCH 1/5] usb: isp1760: ignore return value for bus change pattern Rui Miguel Silva
2021-08-19 18:09 ` Rui Miguel Silva [this message]
2021-08-19 18:09 ` [PATCH 3/5] usb: isp1760: do not reset retval Rui Miguel Silva
2021-08-19 18:09 ` [PATCH 4/5] usb: isp1760: do not shift in uninitialized slot Rui Miguel Silva
2021-08-19 18:09 ` [PATCH 5/5] usb: isp1760: clean never read udc_enabled warning Rui Miguel Silva
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