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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


  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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