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tracing/probe: Check event name length correctly

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Ensure given name of event is not too long when parsing it,
and fix to update event name offset correctly when the group
name is given. For example, this makes probe event to check
the "p:foo/" error case correctly.

Link: http://lkml.kernel.org/r/155253782046.14922.14724124823730168629.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu 2019-03-14 13:30:20 +09:00 committed by Steven Rostedt (VMware)
parent 287c038c0b
commit dec65d79fd
1 changed files with 7 additions and 1 deletions
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8
kernel/trace/trace_probe.c
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@ -159,6 +159,7 @@ int traceprobe_parse_event_name(const char **pevent, const char **pgroup,
char *buf)
{
const char *slash, *event = *pevent;
int len;
slash = strchr(event, '/');
if (slash) {
@ -173,10 +174,15 @@ int traceprobe_parse_event_name(const char **pevent, const char **pgroup,
strlcpy(buf, event, slash - event + 1);
*pgroup = buf;
*pevent = slash + 1;
event = *pevent;
}
if (strlen(event) == 0) {
len = strlen(event);
if (len == 0) {
pr_info("Event name is not specified\n");
return -EINVAL;
} else if (len > MAX_EVENT_NAME_LEN) {
pr_info("Event name is too long\n");
return -E2BIG;
}
return 0;
}