Received-SPF: pass (google.com: domain of linux-kernel+bounces-117291-linux.lists.archive=gmail.com@vger.kernel.org designates 139.178.88.99 as permitted sender) client-ip=139.178.88.99;
From: Ricardo Ribalda <ribalda@chromium.org>
Date: Mon, 25 Mar 2024 14:50:25 +0000
Subject: [PATCH v3 3/3] media: dvbdev: Initialize sbuf
Precedence: bulk
MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 8bit
Message-Id: <20240325-gcc-arm-warnings-v3-3-81b8c10dc18a@chromium.org>
References: <20240325-gcc-arm-warnings-v3-0-81b8c10dc18a@chromium.org>
In-Reply-To: <20240325-gcc-arm-warnings-v3-0-81b8c10dc18a@chromium.org>
To: Thierry Reding <thierry.reding@gmail.com>, 
 Jonathan Hunter <jonathanh@nvidia.com>, 
 Sowjanya Komatineni <skomatineni@nvidia.com>, 
 Luca Ceresoli <luca.ceresoli@bootlin.com>, 
 Mauro Carvalho Chehab <mchehab@kernel.org>, 
 Greg Kroah-Hartman <gregkh@linuxfoundation.org>, 
 Hans Verkuil <hverkuil@xs4all.nl>
Cc: linux-media@vger.kernel.org, linux-tegra@vger.kernel.org, 
 linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org, 
 Ricardo Ribalda <ribalda@chromium.org>

Because the size passed to copy_from_user() cannot be known beforehand,
it needs to be checked during runtime with check_object_size. That makes
gcc believe that the content of sbuf can be used before init.

Fix:
/include/linux/thread_info.h:215:17: warning: ‘sbuf’ may be used uninitialized [-Wmaybe-uninitialized]

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
 drivers/media/dvb-core/dvbdev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/dvb-core/dvbdev.c b/drivers/media/dvb-core/dvbdev.c
index 733d0bc4b4cc3..b43695bc51e75 100644
--- a/drivers/media/dvb-core/dvbdev.c
+++ b/drivers/media/dvb-core/dvbdev.c
@@ -956,7 +956,7 @@ int dvb_usercopy(struct file *file,
 		 int (*func)(struct file *file,
 			     unsigned int cmd, void *arg))
 {
-	char    sbuf[128];
+	char    sbuf[128] = {};
 	void    *mbuf = NULL;
 	void    *parg = NULL;
 	int     err  = -EINVAL;

-- 
2.44.0.396.g6e790dbe36-goog