linux-kernel - [PATCH v2 3/3] media: dvbdev: Initialize sbuf

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Date: Mon, 25 Mar 2024 14:19:55 +0000
From: Ricardo Ribalda <ribalda@...omium.org>
To: Thierry Reding <thierry.reding@...il.com>, 
 Jonathan Hunter <jonathanh@...dia.com>, 
 Sowjanya Komatineni <skomatineni@...dia.com>, 
 Luca Ceresoli <luca.ceresoli@...tlin.com>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Hans Verkuil <hverkuil@...all.nl>
Cc: linux-media@...r.kernel.org, linux-tegra@...r.kernel.org, 
 linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org, 
 Ricardo Ribalda <ribalda@...omium.org>
Subject: [PATCH v2 3/3] media: dvbdev: Initialize sbuf

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@...omium.org>
---
 drivers/media/dvb-core/dvbdev.c             | 2 +-
 drivers/staging/media/tegra-video/tegra20.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

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;
diff --git a/drivers/staging/media/tegra-video/tegra20.c b/drivers/staging/media/tegra-video/tegra20.c
index c39b52d0e4447..630e2ff987a37 100644
--- a/drivers/staging/media/tegra-video/tegra20.c
+++ b/drivers/staging/media/tegra-video/tegra20.c
@@ -164,6 +164,7 @@ static void tegra20_vi_get_input_formats(struct tegra_vi_channel *chan,
 	unsigned int input_mbus_code = chan->fmtinfo->code;
 
 	(*main_input_format) = VI_INPUT_INPUT_FORMAT_YUV422;
+	(*yuv_input_format) = VI_INPUT_YUV_INPUT_FORMAT_UYVY;
 
 	switch (input_mbus_code) {
 	case MEDIA_BUS_FMT_UYVY8_2X8:
@@ -176,7 +177,6 @@ static void tegra20_vi_get_input_formats(struct tegra_vi_channel *chan,
 		(*yuv_input_format) = VI_INPUT_YUV_INPUT_FORMAT_YUYV;
 		break;
 	case MEDIA_BUS_FMT_YVYU8_2X8:
-	default:
 		(*yuv_input_format) = VI_INPUT_YUV_INPUT_FORMAT_YVYU;
 		break;
 	}

-- 
2.44.0.396.g6e790dbe36-goog