tracing: Initialize ret in syscall_enter_define_fields()

If syscall_enter_define_fields() is called on a system call with no
arguments, the return code variable "ret" will never get initialized.
Initialize it to zero.

Fixes: 04ae87a52074e ("ftrace: Rework event_create_dir()")
Reported-by: Qian Cai <[email protected]>
Signed-off-by: Steven Rostedt (VMware) <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index 73140d80dd46180fc5335a6cbcdd724d86996df6..2978c29d87d4784e4805732331fc1110ed3a4c94 100644 (file)
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -274,7 +274,8 @@ static int __init syscall_enter_define_fields(struct trace_event_call *call)
        struct syscall_trace_enter trace;
        struct syscall_metadata *meta = call->data;
        int offset = offsetof(typeof(trace), args);
-       int ret, i;
+       int ret = 0;
+       int i;
 
        for (i = 0; i < meta->nb_args; i++) {
                ret = trace_define_field(call, meta->types[i],