[PATCH v4 1/9] xen/dt: dt_property_read_string should return -ENODATA on !length

[Stefano Stabellini <sstabellini@kernel.org>]

From: Stefano Stabellini <stefano.stabellini@xilinx.com>

When the length is zero (pp->length == 0), dt_property_read_string
should return -ENODATA, but actually currently returns -EILSEQ because
there is no specific check for lenght == 0.

Add a check now.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xilinx.com>
---
 xen/common/device_tree.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c
index 4aae281e89..db67fb5fb4 100644
--- a/xen/common/device_tree.c
+++ b/xen/common/device_tree.c
@@ -198,7 +198,7 @@ int dt_property_read_string(const struct dt_device_node *np,
 
     if ( !pp )
         return -EINVAL;
-    if ( !pp->value )
+    if ( !pp->value || !pp->length )
         return -ENODATA;
     if ( strnlen(pp->value, pp->length) >= pp->length )
         return -EILSEQ;
-- 
2.25.1