tracing/probe: Fix same probe event argument matching

Commit fe60b0ce8e73 ("tracing/probe: Reject exactly same probe event")
tries to reject a event which matches an already existing probe.

However it currently continues to match arguments and rejects adding a
probe even when the arguments don't match. Fix this by only rejecting a
probe if and only if all the arguments match.

Link: http://lkml.kernel.org/r/20190924114906.14038-1-srikar@linux.vnet.ibm.com
Fixes: fe60b0ce8e73 ("tracing/probe: Reject exactly same probe event")
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index a6697e2..402dc3c 100644 (file)
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -549,10 +549,11 @@ static bool trace_kprobe_has_same_kprobe(struct trace_kprobe *orig,
                for (i = 0; i < orig->tp.nr_args; i++) {
                        if (strcmp(orig->tp.args[i].comm,
                                   comp->tp.args[i].comm))
-                               continue;
+                               break;
                }
 
-               return true;
+               if (i == orig->tp.nr_args)
+                       return true;
        }
 
        return false;

diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 34dd6d0..dd88434 100644 (file)
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -431,10 +431,11 @@ static bool trace_uprobe_has_same_uprobe(struct trace_uprobe *orig,
                for (i = 0; i < orig->tp.nr_args; i++) {
                        if (strcmp(orig->tp.args[i].comm,
                                   comp->tp.args[i].comm))
-                               continue;
+                               break;
                }
 
-               return true;
+               if (i == orig->tp.nr_args)
+                       return true;
        }
 
        return false;