of: overlay: validate offset from property fixups
commit 482137bf2a
upstream.
The smatch static checker marks the data in offset as untrusted,
leading it to warn:
drivers/of/resolver.c:125 update_usages_of_a_phandle_reference()
error: buffer underflow 'prop->value' 's32min-s32max'
Add check to verify that offset is within the property data.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Frank Rowand <frank.rowand@sony.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
parent
728ea2302a
commit
4910cc250b
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@ -129,6 +129,11 @@ static int update_usages_of_a_phandle_reference(struct device_node *overlay,
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goto err_fail;
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}
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if (offset < 0 || offset + sizeof(__be32) > prop->length) {
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err = -EINVAL;
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goto err_fail;
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}
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*(__be32 *)(prop->value + offset) = cpu_to_be32(phandle);
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}
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