From: Andrzej Hajda <a.hajda@xxxxxxxxxxx>
of_get_flat_dt_subnode_by_name can return negative value in case of error.
The problem has been detected using semantic patch
scripts/coccinelle/tests/unsigned_lesser_than_zero.cocci
Signed-off-by: Andrzej Hajda <a.hajda@xxxxxxxxxxx>
Cc: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
Cc: Leif Lindholm <leif.lindholm@xxxxxxxxxx>
Cc: Mark Salter <msalter@xxxxxxxxxx>
Cc: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
Signed-off-by: Matt Fleming <matt@xxxxxxxxxxxxxxxxxxx>
---
drivers/firmware/efi/efi.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index 5a2631af7410..7dd2e2d37231 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -657,9 +657,12 @@ static int __init fdt_find_uefi_params(unsigned long node, const char *uname,
}
if (subnode) {
- node = of_get_flat_dt_subnode_by_name(node, subnode);
- if (node < 0)
+ int err = of_get_flat_dt_subnode_by_name(node, subnode);
+
+ if (err < 0)
return 0;
+
+ node = err;
}
return __find_uefi_params(node, info, dt_params[i].params);
--
2.7.3
--
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