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of: fix of_device_get_modalias returned length when truncating buffers

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[ Upstream commit bcf54d5385 ]

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@kernel.org>
Cc: Frank Rowand <frowand.list@gmail.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rob Herring 2017-01-16 14:28:39 -06:00 committed by Greg Kroah-Hartman
parent 1fb9c2f41e
commit 6ba32c648a
1 changed files with 1 additions and 1 deletions
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2
drivers/of/device.c
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@ -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);