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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Tom Rix <trix@redhat.com>,
        Arnd Bergmann <arnd@arndb.de>, Sam Ravnborg <sam@ravnborg.org>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.9 023/117] video: fbdev: pvr2fb: initialize variables
Date:   Mon,  9 Nov 2020 13:54:09 +0100
Message-Id: <20201109125026.754543907@linuxfoundation.org>
In-Reply-To: <20201109125025.630721781@linuxfoundation.org>
References: <20201109125025.630721781@linuxfoundation.org>
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From: Tom Rix <trix@redhat.com>

[ Upstream commit 8e1ba47c60bcd325fdd097cd76054639155e5d2e ]

clang static analysis reports this repesentative error

pvr2fb.c:1049:2: warning: 1st function call argument
  is an uninitialized value [core.CallAndMessage]
        if (*cable_arg)
        ^~~~~~~~~~~~~~~

Problem is that cable_arg depends on the input loop to
set the cable_arg[0].  If it does not, then some random
value from the stack is used.

A similar problem exists for output_arg.

So initialize cable_arg and output_arg.

Signed-off-by: Tom Rix <trix@redhat.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200720191845.20115-1-trix@redhat.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/video/fbdev/pvr2fb.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/video/fbdev/pvr2fb.c b/drivers/video/fbdev/pvr2fb.c
index a2564ab91e62d..27478ffeeacdc 100644
--- a/drivers/video/fbdev/pvr2fb.c
+++ b/drivers/video/fbdev/pvr2fb.c
@@ -1029,6 +1029,8 @@ static int __init pvr2fb_setup(char *options)
 	if (!options || !*options)
 		return 0;
 
+	cable_arg[0] = output_arg[0] = 0;
+
 	while ((this_opt = strsep(&options, ","))) {
 		if (!*this_opt)
 			continue;
-- 
2.27.0