of: properly check for error returned by fdt_get_name()

fdt_get_name() returns error values via a parameter pointer
instead of in function return.  Fix check for this error value
in populate_node() and callers of populate_node().

Chasing up the caller tree showed callers of various functions
failing to initialize the value of pointer parameters that
can return error values.  Initialize those values to NULL.

The bug was introduced by
commit e6a6928c ("of/fdt: Convert FDT functions to use libfdt")
but this patch can not be backported directly to that commit
because the relevant code has further been restructured by
commit dfbd4c6e ("drivers/of: Split unflatten_dt_node()")

The bug became visible by triggering a crash on openrisc with:
commit 79edff12 ("scripts/dtc: Update to upstream version v1.6.0-51-g183df9e9c2b9")
as reported in:
https://lore.kernel.org/lkml/20210327224116.69309-1-linux@roeck-us.net/

Fixes: 79edff12 ("scripts/dtc: Update to upstream version v1.6.0-51-g183df9e9c2b9")
Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Frank Rowand <frank.rowand@sony.com>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20210405032845.1942533-1-frowand.list@gmail.comSigned-off-by: Rob Herring <robh@kernel.org>

drivers/of/fdt.c

@@ -205,7 +205,7 @@ static void populate_properties(const void *blob,
 		*pprev = NULL;
 }
 
-static bool populate_node(const void *blob,
+static int populate_node(const void *blob,
 			  int offset,
 			  void **mem,
 			  struct device_node *dad,
@@ -214,24 +214,24 @@ static bool populate_node(const void *blob,
 {
 	struct device_node *np;
 	const char *pathp;
-	unsigned int l, allocl;
+	int len;
 
-	pathp = fdt_get_name(blob, offset, &l);
+	pathp = fdt_get_name(blob, offset, &len);
 	if (!pathp) {
 		*pnp = NULL;
-		return false;
+		return len;
 	}
 
-	allocl = ++l;
+	len++;
 
-	np = unflatten_dt_alloc(mem, sizeof(struct device_node) + allocl,
+	np = unflatten_dt_alloc(mem, sizeof(struct device_node) + len,
 				__alignof__(struct device_node));
 	if (!dryrun) {
 		char *fn;
 		of_node_init(np);
 		np->full_name = fn = ((char *)np) + sizeof(*np);
 
-		memcpy(fn, pathp, l);
+		memcpy(fn, pathp, len);
 
 		if (dad != NULL) {
 			np->parent = dad;
@@ -295,6 +295,7 @@ static int unflatten_dt_nodes(const void *blob,
 	struct device_node *nps[FDT_MAX_DEPTH];
 	void *base = mem;
 	bool dryrun = !base;
+	int ret;
 
 	if (nodepp)
 		*nodepp = NULL;
@@ -322,9 +323,10 @@ static int unflatten_dt_nodes(const void *blob,
 		    !of_fdt_device_is_available(blob, offset))
 			continue;
 
-		if (!populate_node(blob, offset, &mem, nps[depth],
-				   &nps[depth+1], dryrun))
-			return mem - base;
+		ret = populate_node(blob, offset, &mem, nps[depth],
+				   &nps[depth+1], dryrun);
+		if (ret < 0)
+			return ret;
 
 		if (!dryrun && nodepp && !*nodepp)
 			*nodepp = nps[depth+1];
@@ -372,6 +374,10 @@ void *__unflatten_device_tree(const void *blob,
 {
 	int size;
 	void *mem;
+	int ret;
+
+	if (mynodes)
+		*mynodes = NULL;
 
 	pr_debug(" -> unflatten_device_tree()\n");
 
@@ -392,7 +398,7 @@ void *__unflatten_device_tree(const void *blob,
 
 	/* First pass, scan for size */
 	size = unflatten_dt_nodes(blob, NULL, dad, NULL);
-	if (size < 0)
+	if (size <= 0)
 		return NULL;
 
 	size = ALIGN(size, 4);
@@ -410,12 +416,16 @@ void *__unflatten_device_tree(const void *blob,
 	pr_debug("  unflattening %p...\n", mem);
 
 	/* Second pass, do actual unflattening */
-	unflatten_dt_nodes(blob, mem, dad, mynodes);
+	ret = unflatten_dt_nodes(blob, mem, dad, mynodes);
+
 	if (be32_to_cpup(mem + size) != 0xdeadbeef)
 		pr_warn("End of tree marker overwritten: %08x\n",
 			be32_to_cpup(mem + size));
 
-	if (detached && mynodes) {
+	if (ret <= 0)
+		return NULL;
+
+	if (detached && mynodes && *mynodes) {
 		of_node_set_flag(*mynodes, OF_DETACHED);
 		pr_debug("unflattened tree is detached\n");
 	}

drivers/of/overlay.c

@@ -1017,7 +1017,7 @@ int of_overlay_fdt_apply(const void *overlay_fdt, u32 overlay_fdt_size,
 	const void *new_fdt;
 	int ret;
 	u32 size;
-	struct device_node *overlay_root;
+	struct device_node *overlay_root = NULL;
 
 	*ovcs_id = 0;
 	ret = 0;

drivers/of/unittest.c

@@ -1408,7 +1408,7 @@ static void attach_node_and_children(struct device_node *np)
 static int __init unittest_data_add(void)
 {
 	void *unittest_data;
-	struct device_node *unittest_data_node, *np;
+	struct device_node *unittest_data_node = NULL, *np;
 	/*
 	 * __dtb_testcases_begin[] and __dtb_testcases_end[] are magically
 	 * created by cmd_dt_S_dtb in scripts/Makefile.lib
@@ -1417,10 +1417,10 @@ static int __init unittest_data_add(void)
 	extern uint8_t __dtb_testcases_end[];
 	const int size = __dtb_testcases_end - __dtb_testcases_begin;
 	int rc;
+	void *ret;
 
 	if (!size) {
-		pr_warn("%s: No testcase data to attach; not running tests\n",
-			__func__);
+		pr_warn("%s: testcases is empty\n", __func__);
 		return -ENODATA;
 	}
 
@@ -1429,9 +1429,14 @@ static int __init unittest_data_add(void)
 	if (!unittest_data)
 		return -ENOMEM;
 
-	of_fdt_unflatten_tree(unittest_data, NULL, &unittest_data_node);
+	ret = of_fdt_unflatten_tree(unittest_data, NULL, &unittest_data_node);
+	if (!ret) {
+		pr_warn("%s: unflatten testcases tree failed\n", __func__);
+		kfree(unittest_data);
+		return -ENODATA;
+	}
 	if (!unittest_data_node) {
-		pr_warn("%s: No tree to attach; not running tests\n", __func__);
+		pr_warn("%s: testcases tree is empty\n", __func__);
 		kfree(unittest_data);
 		return -ENODATA;
 	}