linux-kernel - [PATCH AUTOSEL for 4.4 023/115] of: fix of_device_get_modalias returned length when truncating buffers

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Date:   Sat, 3 Mar 2018 22:31:01 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Rob Herring <robh@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.4 023/115] of: fix of_device_get_modalias
 returned length when truncating buffers

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>
---
 drivers/of/device.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/of/device.c b/drivers/of/device.c
index 97a280d50d6d..7c509bff9295 100644
--- a/drivers/of/device.c
+++ b/drivers/of/device.c
@@ -223,7 +223,7 @@ ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len)
 			str[i] = '_';
 	}
 
-	return tsize;
+	return repend;
 }
 EXPORT_SYMBOL_GPL(of_device_get_modalias);
 
-- 
2.14.1