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Message-ID: <3a35551149e5ee0cb0950035afcb8082c3b5d05b.1707217097.git.bristot@kernel.org>
Date: Tue, 6 Feb 2024 12:05:34 +0100
From: Daniel Bristot de Oliveira <bristot@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: Daniel Bristot de Oliveira <bristot@...nel.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
Nathan Chancellor <nathan@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Bill Wendling <morbo@...gle.com>,
Justin Stitt <justinstitt@...gle.com>,
Donald Zickus <dzickus@...hat.com>,
stable@...r.kernel.org,
linux-trace-kernel@...r.kernel.org,
linux-kernel@...r.kernel.org,
llvm@...ts.linux.dev
Subject: [PATCH 6/6] tools/rv: Fix curr_reactor uninitialized variable
clang is reporting:
$ make HOSTCC=clang CC=clang LLVM_IAS=1
clang -O -g -DVERSION=\"6.8.0-rc3\" -flto=auto -fexceptions
-fstack-protector-strong -fasynchronous-unwind-tables
-fstack-clash-protection -Wall -Werror=format-security
-Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS
$(pkg-config --cflags libtracefs) -I include
-c -o src/in_kernel.o src/in_kernel.c
[...]
src/in_kernel.c:227:6: warning: variable 'curr_reactor' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
227 | if (!end)
| ^~~~
src/in_kernel.c:242:9: note: uninitialized use occurs here
242 | return curr_reactor;
| ^~~~~~~~~~~~
src/in_kernel.c:227:2: note: remove the 'if' if its condition is always false
227 | if (!end)
| ^~~~~~~~~
228 | goto out_free;
| ~~~~~~~~~~~~~
src/in_kernel.c:221:6: warning: variable 'curr_reactor' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
221 | if (!start)
| ^~~~~~
src/in_kernel.c:242:9: note: uninitialized use occurs here
242 | return curr_reactor;
| ^~~~~~~~~~~~
src/in_kernel.c:221:2: note: remove the 'if' if its condition is always false
221 | if (!start)
| ^~~~~~~~~~~
222 | goto out_free;
| ~~~~~~~~~~~~~
src/in_kernel.c:215:20: note: initialize the variable 'curr_reactor' to silence this warning
215 | char *curr_reactor;
| ^
| = NULL
2 warnings generated.
Which is correct. Setting curr_reactor to NULL avoids the problem.
Cc: stable@...r.kernel.org
Fixes: 6d60f89691fc ("tools/rv: Add in-kernel monitor interface")
Signed-off-by: Daniel Bristot de Oliveira <bristot@...nel.org>
---
tools/verification/rv/src/in_kernel.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/verification/rv/src/in_kernel.c b/tools/verification/rv/src/in_kernel.c
index ad28582bcf2b..f04479ecc96c 100644
--- a/tools/verification/rv/src/in_kernel.c
+++ b/tools/verification/rv/src/in_kernel.c
@@ -210,9 +210,9 @@ static char *ikm_read_reactor(char *monitor_name)
static char *ikm_get_current_reactor(char *monitor_name)
{
char *reactors = ikm_read_reactor(monitor_name);
+ char *curr_reactor = NULL;
char *start;
char *end;
- char *curr_reactor;
if (!reactors)
return NULL;
--
2.43.0
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