linux-kernel - [PATCH] video: fbdev: pvr2fb: initialize variables

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Message-Id: <20200720191845.20115-1-trix@redhat.com>
Date:   Mon, 20 Jul 2020 12:18:45 -0700
From:   trix@...hat.com
To:     b.zolnierkie@...sung.com, jhubbard@...dia.com, sam@...nborg.org,
        daniel.vetter@...ll.ch, gustavo@...eddedor.com, arnd@...db.de,
        jani.nikula@...el.com
Cc:     dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Tom Rix <trix@...hat.com>
Subject: [PATCH] video: fbdev: pvr2fb: initialize variables

From: Tom Rix <trix@...hat.com>

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@...hat.com>
---
 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 2d9f69b93392..f4add36cb5f4 100644
--- a/drivers/video/fbdev/pvr2fb.c
+++ b/drivers/video/fbdev/pvr2fb.c
@@ -1028,6 +1028,8 @@ 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;
-- 
2.18.1