linux-kernel - [PATCH 05/10] of: Fix available buffer size calculating error in API of_device_uevent

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Message-Id: <20241206-of_core_fix-v1-5-dc28ed56bec3@quicinc.com>
Date: Fri, 06 Dec 2024 08:52:31 +0800
From: Zijun Hu <zijun_hu@...oud.com>
To: Rob Herring <robh@...nel.org>, Saravana Kannan <saravanak@...gle.com>, 
 Leif Lindholm <leif.lindholm@...aro.org>, 
 Stephen Boyd <stephen.boyd@...aro.org>, Maxime Ripard <mripard@...nel.org>, 
 Robin Murphy <robin.murphy@....com>, 
 Grant Likely <grant.likely@...retlab.ca>
Cc: Zijun Hu <zijun_hu@...oud.com>, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Zijun Hu <quic_zijuhu@...cinc.com>
Subject: [PATCH 05/10] of: Fix available buffer size calculating error in
 API of_device_uevent_modalias()

From: Zijun Hu <quic_zijuhu@...cinc.com>

of_device_uevent_modalias() saves MODALIAS value from offset
(@env->buflen - 1), so the available buffer size should be
(sizeof(@env->buf) - @env->buflen + 1), but it uses the wrong
size (sizeof(@env->buf) - @env->buflen).

Fix by using right size (sizeof(@env->buf) - @env->buflen + 1).

Fixes: dd27dcda37f0 ("of/device: merge of_device_uevent")
Signed-off-by: Zijun Hu <quic_zijuhu@...cinc.com>
---
 drivers/of/device.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/of/device.c b/drivers/of/device.c
index edf3be1972658f6dc165f577da53b10c7eebc116..ee29c07c83b9e6abd9b1c7747dd341026bc79eb0 100644
--- a/drivers/of/device.c
+++ b/drivers/of/device.c
@@ -266,10 +266,10 @@ int of_device_uevent_modalias(const struct device *dev, struct kobj_uevent_env *
 		return -ENOMEM;
 
 	sl = of_modalias(dev->of_node, &env->buf[env->buflen-1],
-			 sizeof(env->buf) - env->buflen);
+			 sizeof(env->buf) - env->buflen + 1);
 	if (sl < 0)
 		return sl;
-	if (sl >= (sizeof(env->buf) - env->buflen))
+	if (sl >= (sizeof(env->buf) - env->buflen + 1))
 		return -ENOMEM;
 	env->buflen += sl;
 

-- 
2.34.1