[PATCH AUTOSEL 4.14 10/46] video: fbdev: pvr2fb: initialize variables

From: Sasha Levin
Date: Mon Oct 26 2020 - 20:19:19 EST


From: Tom Rix <trix@xxxxxxxxxx>

[ 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@xxxxxxxxxx>
Acked-by: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20200720191845.20115-1-trix@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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 867c5218968f7..426e79061bc88 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;
--
2.25.1