linux-kernel - [PATCH AUTOSEL 5.15 13/50] video: fbdev: nvidiafb: Use strscpy() to prevent buffer overflow

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Message-Id: <20220330115005.1671090-13-sashal@kernel.org>
Date:   Wed, 30 Mar 2022 07:49:27 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Tim Gardner <tim.gardner@...onical.com>,
        Antonino Daplas <adaplas@...il.com>,
        linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Helge Deller <deller@....de>, Sasha Levin <sashal@...nel.org>,
        tomi.valkeinen@...com
Subject: [PATCH AUTOSEL 5.15 13/50] video: fbdev: nvidiafb: Use strscpy() to prevent buffer overflow

From: Tim Gardner <tim.gardner@...onical.com>

[ Upstream commit 37a1a2e6eeeb101285cd34e12e48a881524701aa ]

Coverity complains of a possible buffer overflow. However,
given the 'static' scope of nvidia_setup_i2c_bus() it looks
like that can't happen after examiniing the call sites.

CID 19036 (#1 of 1): Copy into fixed size buffer (STRING_OVERFLOW)
1. fixed_size_dest: You might overrun the 48-character fixed-size string
  chan->adapter.name by copying name without checking the length.
2. parameter_as_source: Note: This defect has an elevated risk because the
  source argument is a parameter of the current function.
 89        strcpy(chan->adapter.name, name);

Fix this warning by using strscpy() which will silence the warning and
prevent any future buffer overflows should the names used to identify the
channel become much longer.

Cc: Antonino Daplas <adaplas@...il.com>
Cc: linux-fbdev@...r.kernel.org
Cc: dri-devel@...ts.freedesktop.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Tim Gardner <tim.gardner@...onical.com>
Signed-off-by: Helge Deller <deller@....de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/video/fbdev/nvidia/nv_i2c.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/video/fbdev/nvidia/nv_i2c.c b/drivers/video/fbdev/nvidia/nv_i2c.c
index d7994a173245..0b48965a6420 100644
--- a/drivers/video/fbdev/nvidia/nv_i2c.c
+++ b/drivers/video/fbdev/nvidia/nv_i2c.c
@@ -86,7 +86,7 @@ static int nvidia_setup_i2c_bus(struct nvidia_i2c_chan *chan, const char *name,
 {
 	int rc;

-	strcpy(chan->adapter.name, name);
+	strscpy(chan->adapter.name, name, sizeof(chan->adapter.name));
 	chan->adapter.owner = THIS_MODULE;
 	chan->adapter.class = i2c_class;
 	chan->adapter.algo_data = &chan->algo;
-- 
2.34.1