linux-kernel - [PATCH 6/6] efi/fdt: Fix handling error value in fdt_find_uefi

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Date:   Fri, 19 Aug 2016 21:35:04 +0100
From:   Matt Fleming <matt@...eblueprint.co.uk>
To:     Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H . Peter Anvin" <hpa@...or.com>
Cc:     Andrzej Hajda <a.hajda@...sung.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
        Matt Fleming <matt@...eblueprint.co.uk>,
        Leif Lindholm <leif.lindholm@...aro.org>,
        Mark Salter <msalter@...hat.com>,
        Shannon Zhao <shannon.zhao@...aro.org>
Subject: [PATCH 6/6] efi/fdt: Fix handling error value in fdt_find_uefi_params

From: Andrzej Hajda <a.hajda@...sung.com>

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@...sung.com>
Cc: Shannon Zhao <shannon.zhao@...aro.org>
Cc: Leif Lindholm <leif.lindholm@...aro.org>
Cc: Mark Salter <msalter@...hat.com>
Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Signed-off-by: Matt Fleming <matt@...eblueprint.co.uk>
---
 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