Patch "of: unittest: fix null pointer dereferencing in of_unittest_find_node_by_name()" has been added to the 6.4-stable tree

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This is a note to let you know that I've just added the patch titled

    of: unittest: fix null pointer dereferencing in of_unittest_find_node_by_name()

to the 6.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     of-unittest-fix-null-pointer-dereferencing-in-of_uni.patch
and it can be found in the queue-6.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 65676056e35b3de28153a578f525496ce12ed0d4
Author: Ruan Jinjie <ruanjinjie@xxxxxxxxxx>
Date:   Thu Jul 27 16:02:46 2023 +0800

    of: unittest: fix null pointer dereferencing in of_unittest_find_node_by_name()
    
    [ Upstream commit d6ce4f0ea19c32f10867ed93d8386924326ab474 ]
    
    when kmalloc() fail to allocate memory in kasprintf(), name
    or full_name will be NULL, strcmp() will cause
    null pointer dereference.
    
    Fixes: 0d638a07d3a1 ("of: Convert to using %pOF instead of full_name")
    Signed-off-by: Ruan Jinjie <ruanjinjie@xxxxxxxxxx>
    Link: https://lore.kernel.org/r/20230727080246.519539-1-ruanjinjie@xxxxxxxxxx
    Signed-off-by: Rob Herring <robh@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
index 4fe02e9f7dcdd..be41eb246b6b2 100644
--- a/drivers/of/unittest.c
+++ b/drivers/of/unittest.c
@@ -77,7 +77,7 @@ static void __init of_unittest_find_node_by_name(void)
 
 	np = of_find_node_by_path("/testcase-data");
 	name = kasprintf(GFP_KERNEL, "%pOF", np);
-	unittest(np && !strcmp("/testcase-data", name),
+	unittest(np && name && !strcmp("/testcase-data", name),
 		"find /testcase-data failed\n");
 	of_node_put(np);
 	kfree(name);
@@ -88,14 +88,14 @@ static void __init of_unittest_find_node_by_name(void)
 
 	np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
 	name = kasprintf(GFP_KERNEL, "%pOF", np);
-	unittest(np && !strcmp("/testcase-data/phandle-tests/consumer-a", name),
+	unittest(np && name && !strcmp("/testcase-data/phandle-tests/consumer-a", name),
 		"find /testcase-data/phandle-tests/consumer-a failed\n");
 	of_node_put(np);
 	kfree(name);
 
 	np = of_find_node_by_path("testcase-alias");
 	name = kasprintf(GFP_KERNEL, "%pOF", np);
-	unittest(np && !strcmp("/testcase-data", name),
+	unittest(np && name && !strcmp("/testcase-data", name),
 		"find testcase-alias failed\n");
 	of_node_put(np);
 	kfree(name);
@@ -106,7 +106,7 @@ static void __init of_unittest_find_node_by_name(void)
 
 	np = of_find_node_by_path("testcase-alias/phandle-tests/consumer-a");
 	name = kasprintf(GFP_KERNEL, "%pOF", np);
-	unittest(np && !strcmp("/testcase-data/phandle-tests/consumer-a", name),
+	unittest(np && name && !strcmp("/testcase-data/phandle-tests/consumer-a", name),
 		"find testcase-alias/phandle-tests/consumer-a failed\n");
 	of_node_put(np);
 	kfree(name);
@@ -1533,6 +1533,8 @@ static void attach_node_and_children(struct device_node *np)
 	const char *full_name;
 
 	full_name = kasprintf(GFP_KERNEL, "%pOF", np);
+	if (!full_name)
+		return;
 
 	if (!strcmp(full_name, "/__local_fixups__") ||
 	    !strcmp(full_name, "/__fixups__")) {



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