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2024-05-13 9d77db3c730780c8ef5ccd4b66403ff5675cfe4e 
 kernel/scripts/dtc/libfdt/fdt_overlay.c
....@@ -1,53 +1,8 @@
1
+// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
12 /*
23  * libfdt - Flat Device Tree manipulation
34  * Copyright (C) 2016 Free Electrons
45  * Copyright (C) 2016 NextThing Co.
5
- *
6
- * libfdt is dual licensed: you can use it either under the terms of
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- * the GPL, or the BSD license, at your option.
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- *
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- *  a) This library is free software; you can redistribute it and/or
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- *     modify it under the terms of the GNU General Public License as
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- *     published by the Free Software Foundation; either version 2 of the
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- *     License, or (at your option) any later version.
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- *
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- *     This library is distributed in the hope that it will be useful,
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- *     but WITHOUT ANY WARRANTY; without even the implied warranty of
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- *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- *     GNU General Public License for more details.
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- *
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- *     You should have received a copy of the GNU General Public
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- *     License along with this library; if not, write to the Free
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- *     Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
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- *     MA 02110-1301 USA
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- *
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- * Alternatively,
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- *
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- *  b) Redistribution and use in source and binary forms, with or
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- *     without modification, are permitted provided that the following
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- *     conditions are met:
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- *
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- *     1. Redistributions of source code must retain the above
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- *        copyright notice, this list of conditions and the following
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- *        disclaimer.
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- *     2. Redistributions in binary form must reproduce the above
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- *        copyright notice, this list of conditions and the following
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- *        disclaimer in the documentation and/or other materials
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- *        provided with the distribution.
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- *
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- *     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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- *     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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- *     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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- *     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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- *     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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- *     CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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- *     SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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- *     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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- *     LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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- *     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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- *     CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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- *     OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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- *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
516  */
527 #include "libfdt_env.h"
538 
....@@ -93,11 +48,11 @@
9348  * @pathp: pointer which receives the path of the target (or NULL)
9449  *
9550  * overlay_get_target() retrieves the target offset in the base
96
- * device tree of a fragment, no matter how the actual targetting is
51
+ * device tree of a fragment, no matter how the actual targeting is
9752  * done (through a phandle or a path)
9853  *
9954  * returns:
100
- *      the targetted node offset in the base device tree
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+ *      the targeted node offset in the base device tree
10156  *      Negative error code on error
10257  */
10358 static int overlay_get_target(const void *fdt, const void *fdto,
....@@ -286,6 +241,7 @@
286241 
287242 		if (fixup_len % sizeof(uint32_t))
288243 			return -FDT_ERR_BADOVERLAY;
244
+		fixup_len /= sizeof(uint32_t);
289245 
290246 		tree_val = fdt_getprop(fdto, tree_node, name, &tree_len);
291247 		if (!tree_val) {
....@@ -295,7 +251,7 @@
295251 			return tree_len;
296252 		}
297253 
298
-		for (i = 0; i < (fixup_len / sizeof(uint32_t)); i++) {
254
+		for (i = 0; i < fixup_len; i++) {
299255 			fdt32_t adj_val;
300256 			uint32_t poffset;
301257 
....@@ -697,7 +653,7 @@
697653 	int len = 0, namelen;
698654 	const char *name;
699655 
700
-	FDT_CHECK_HEADER(fdt);
656
+	FDT_RO_PROBE(fdt);
701657 
702658 	for (;;) {
703659 		name = fdt_get_name(fdt, nodeoffset, &namelen);
....@@ -778,26 +734,36 @@
778734 		/* keep end marker to avoid strlen() */
779735 		e = path + path_len;
780736 
781
-		/* format: /<fragment-name>/__overlay__/<relative-subnode-path> */
782
-
783737 		if (*path != '/')
784738 			return -FDT_ERR_BADVALUE;
785739 
786740 		/* get fragment name first */
787741 		s = strchr(path + 1, '/');
788
-		if (!s)
789
-			return -FDT_ERR_BADOVERLAY;
742
+		if (!s) {
743
+			/* Symbol refers to something that won't end
744
+			 * up in the target tree */
745
+			continue;
746
+		}
790747 
791748 		frag_name = path + 1;
792749 		frag_name_len = s - path - 1;
793750 
794751 		/* verify format; safe since "s" lies in \0 terminated prop */
795752 		len = sizeof("/__overlay__/") - 1;
796
-		if ((e - s) < len || memcmp(s, "/__overlay__/", len))
797
-			return -FDT_ERR_BADOVERLAY;
798
-
799
-		rel_path = s + len;
800
-		rel_path_len = e - rel_path;
753
+		if ((e - s) > len && (memcmp(s, "/__overlay__/", len) == 0)) {
754
+			/* /<fragment-name>/__overlay__/<relative-subnode-path> */
755
+			rel_path = s + len;
756
+			rel_path_len = e - rel_path - 1;
757
+		} else if ((e - s) == len
758
+			   && (memcmp(s, "/__overlay__", len - 1) == 0)) {
759
+			/* /<fragment-name>/__overlay__ */
760
+			rel_path = "";
761
+			rel_path_len = 0;
762
+		} else {
763
+			/* Symbol refers to something that won't end
764
+			 * up in the target tree */
765
+			continue;
766
+		}
801767 
802768 		/* find the fragment index in which the symbol lies */
803769 		ret = fdt_subnode_offset_namelen(fdto, 0, frag_name,
....@@ -863,11 +829,15 @@
863829 
864830 int fdt_overlay_apply(void *fdt, void *fdto)
865831 {
866
-	uint32_t delta = fdt_get_max_phandle(fdt);
832
+	uint32_t delta;
867833 	int ret;
868834 
869
-	FDT_CHECK_HEADER(fdt);
870
-	FDT_CHECK_HEADER(fdto);
835
+	FDT_RO_PROBE(fdt);
836
+	FDT_RO_PROBE(fdto);
837
+
838
+	ret = fdt_find_max_phandle(fdt, &delta);
839
+	if (ret)
840
+		goto err;
871841 
872842 	ret = overlay_adjust_local_phandles(fdto, delta);
873843 	if (ret)