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authorRikard Falkeborn <rikard.falkeborn@gmail.com>2019-04-09 11:15:29 +0200
committerArnaldo Carvalho de Melo <acme@redhat.com>2019-04-16 11:27:36 -0300
commitf32c2877bcb068a718bb70094cd59ccc29d4d082 (patch)
tree371e4eeea966f58dac3c9cddb92ffff8a31d66f3 /tools
parent8002a63f9ace7e9c958408f77f0a4dd4a8414511 (diff)
tools lib traceevent: Fix missing equality check for strcmp
There was a missing comparison with 0 when checking if type is "s64" or "u64". Therefore, the body of the if-statement was entered if "type" was "u64" or not "s64", which made the first strcmp() redundant since if type is "u64", it's not "s64". If type is "s64", the body of the if-statement is not entered but since the remainder of the function consists of if-statements which will not be entered if type is "s64", we will just return "val", which is correct, albeit at the cost of a few more calls to strcmp(), i.e., it will behave just as if the if-statement was entered. If type is neither "s64" or "u64", the body of the if-statement will be entered incorrectly and "val" returned. This means that any type that is checked after "s64" and "u64" is handled the same way as "s64" and "u64", i.e., the limiting of "val" to fit in for example "s8" is never reached. This was introduced in the kernel tree when the sources were copied from trace-cmd in commit f7d82350e597 ("tools/events: Add files to create libtraceevent.a"), and in the trace-cmd repo in 1cdbae6035cei ("Implement typecasting in parser") when the function was introduced, i.e., it has always behaved the wrong way. Detected by cppcheck. Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com> Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Cc: Tzvetomir Stoyanov <tstoyanov@vmware.com> Fixes: f7d82350e597 ("tools/events: Add files to create libtraceevent.a") Link: http://lkml.kernel.org/r/20190409091529.2686-1-rikard.falkeborn@gmail.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/lib/traceevent/event-parse.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index 87494c7c619d..981c6ce2da2c 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -2233,7 +2233,7 @@ eval_type_str(unsigned long long val, const char *type, int pointer)
return val & 0xffffffff;
if (strcmp(type, "u64") == 0 ||
- strcmp(type, "s64"))
+ strcmp(type, "s64") == 0)
return val;
if (strcmp(type, "s8") == 0)