linux-kernel - [PATCH 4.9 050/241] of: fix of_device_get_modalias returned length when truncating buffers

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Date:   Mon, 19 Mar 2018 19:05:15 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Rob Herring <robh@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.9 050/241] of: fix of_device_get_modalias returned length when truncating buffers

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Rob Herring <robh@...nel.org>


[ Upstream commit bcf54d5385abaea9c8026aae6f4eeb348671a52d ]

If the length of the modalias is greater than the buffer size, then the
modalias is truncated. However the untruncated length is returned which
will cause an error. Fix this to return the truncated length. If an error
in the case was desired, then then we should just return -ENOMEM.

The reality is no device will ever have 4KB of compatible strings to hit
this case.

Signed-off-by: Rob Herring <robh@...nel.org>
Cc: Frank Rowand <frowand.list@...il.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/of/device.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/of/device.c
+++ b/drivers/of/device.c
@@ -223,7 +223,7 @@ ssize_t of_device_get_modalias(struct de
 			str[i] = '_';
 	}
 
-	return tsize;
+	return repend;
 }
 EXPORT_SYMBOL_GPL(of_device_get_modalias);