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

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[ 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: 0d638a07d3 ("of: Convert to using %pOF instead of full_name")
Signed-off-by: Ruan Jinjie <ruanjinjie@huawei.com>
Link: https://lore.kernel.org/r/20230727080246.519539-1-ruanjinjie@huawei.com
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ruan Jinjie 2023-07-27 16:02:46 +08:00 committed by Greg Kroah-Hartman
parent 4ab834ff9f
commit 43cc228099
1 changed files with 6 additions and 4 deletions
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10
drivers/of/unittest.c
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@ -70,7 +70,7 @@ 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);
@ -81,14 +81,14 @@ 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);
@ -99,7 +99,7 @@ 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);
@ -1379,6 +1379,8 @@ 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__")) {