linux-kernel - Re: [PATCH 2/2] HID: picolcd: sanity check report size in raw

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Date:	Wed, 27 Aug 2014 23:32:00 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Bruno Prémont <bonbons@...ux-vserver.org>
cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] HID: picolcd: sanity check report size in raw_event()
 callback

On Wed, 27 Aug 2014, Jiri Kosina wrote:

> > Is it worth adding report->id to this hid_warn()?
> > 
> > A valid device is not expected to ever send >64 bytes reports but in
> > case a firmware update would do so it would help to know for which
> > report it was.
> 
> It definitely wouldn't hurt. Pull request with the original patch is now 
> on its way to Linus though, so let's do this as a followup patch on top 
> once this is merged.

I've just queued the below for 3.18.



From: Jiri Kosina <jkosina@...e.cz>
Subject: [PATCH] HID: picolcd: be more verbose when reporting report size error

picolcd device is not expected to send any report with size larger than 64 
bytes.

If this impossible event happens (sic!), print also a report ID to allow 
for easier debugging.

Suggested-by: Bruno Prémont <bonbons@...ux-vserver.org>
Signed-off-by: Jiri Kosina <jkosina@...e.cz>
---
 drivers/hid/hid-picolcd_core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/hid/hid-picolcd_core.c b/drivers/hid/hid-picolcd_core.c
index 020df3c..c1b29a9 100644
--- a/drivers/hid/hid-picolcd_core.c
+++ b/drivers/hid/hid-picolcd_core.c
@@ -351,8 +351,8 @@ static int picolcd_raw_event(struct hid_device *hdev,
 		return 1;
 
 	if (size > 64) {
-		hid_warn(hdev, "invalid size value (%d) for picolcd raw event\n",
-				size);
+		hid_warn(hdev, "invalid size value (%d) for picolcd raw event (%d)\n",
+				size, report->id);
 		return 0;
 	}
 
-- 
Jiri Kosina
SUSE Labs
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