6.4-stable review patch. If anyone has any objections, please let me know.
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From: Ruan Jinjie ruanjinjie@huawei.com
[ 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@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 --- drivers/of/unittest.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)
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__")) {