From: ruanjinjie ruanjinjie@huawei.com
[ Upstream commit ee9d7a0e754568180a2f8ebc4aad226278a9116f ]
When kmalloc() fail to allocate memory in kasprintf(), fn_1 or fn_2 will be NULL, and strcmp() will cause null pointer dereference.
Fixes: 2fe0e8769df9 ("of: overlay: check prevents multiple fragments touching same property") Signed-off-by: ruanjinjie ruanjinjie@huawei.com Link: https://lore.kernel.org/r/20221211023337.592266-1-ruanjinjie@huawei.com Signed-off-by: Rob Herring robh@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/of/overlay.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/of/overlay.c b/drivers/of/overlay.c index c8a0c0e9dec1..67b404f36e79 100644 --- a/drivers/of/overlay.c +++ b/drivers/of/overlay.c @@ -547,7 +547,7 @@ static int find_dup_cset_node_entry(struct overlay_changeset *ovcs,
fn_1 = kasprintf(GFP_KERNEL, "%pOF", ce_1->np); fn_2 = kasprintf(GFP_KERNEL, "%pOF", ce_2->np); - node_path_match = !strcmp(fn_1, fn_2); + node_path_match = !fn_1 || !fn_2 || !strcmp(fn_1, fn_2); kfree(fn_1); kfree(fn_2); if (node_path_match) { @@ -582,7 +582,7 @@ static int find_dup_cset_prop(struct overlay_changeset *ovcs,
fn_1 = kasprintf(GFP_KERNEL, "%pOF", ce_1->np); fn_2 = kasprintf(GFP_KERNEL, "%pOF", ce_2->np); - node_path_match = !strcmp(fn_1, fn_2); + node_path_match = !fn_1 || !fn_2 || !strcmp(fn_1, fn_2); kfree(fn_1); kfree(fn_2); if (node_path_match &&