[U-Boot] [PATVH v7 04/14] regmap: Improve error handling

[Mario Six]

ofnode_read_simple_addr_cells may fail and return a negative error code.
Check for this when initializing regmaps.

Also check if both_len is zero, since this is perfectly possible, and
would lead to a division-by-zero further down the line.

Reviewed-by: Anatolij Gustschin <agust at denx.de>
Reviewed-by: Simon Glass <sjg at chromium.org>
Signed-off-by: Mario Six <mario.six at gdsys.cc>

---

v6 -> v7:
No changes

v5 -> v6:
No changes

v4 -> v5:
No changes

v3 -> v4:
No changes

v2 -> v3:
New in v3

---
 drivers/core/regmap.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/core/regmap.c b/drivers/core/regmap.c
index 77f6f520a0..4ebab23349 100644
--- a/drivers/core/regmap.c
+++ b/drivers/core/regmap.c
@@ -67,8 +67,25 @@ int regmap_init_mem(ofnode node, struct regmap **mapp)
 	struct resource r;

 	addr_len = ofnode_read_simple_addr_cells(ofnode_get_parent(node));
+	if (addr_len < 0) {
+		debug("%s: Error while reading the addr length (ret = %d)\n",
+		      ofnode_get_name(node), addr_len);
+		return addr_len;
+	}
+
 	size_len = ofnode_read_simple_size_cells(ofnode_get_parent(node));
+	if (size_len < 0) {
+		debug("%s: Error while reading the size length: (ret = %d)\n",
+		      ofnode_get_name(node), size_len);
+		return size_len;
+	}
+
 	both_len = addr_len + size_len;
+	if (!both_len) {
+		debug("%s: Both addr and size length are zero\n",
+		      ofnode_get_name(node));
+		return -EINVAL;
+	}

 	len = ofnode_read_size(node, "reg");
 	if (len < 0)
--
2.16.4