Merge tag 'probes-fixes-v7.0-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

Pull tracing probe fix from Masami Hiramatsu:
 "Reject non-closed empty immediate strings

  Fix a buffer index underflow bug that occurred when passing an
  non-closed empty immediate string to the probe event"

* tag 'probes-fixes-v7.0-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  tracing/probe: reject non-closed empty immediate strings

Author: torvalds

kernel/trace/trace_probe.c

@@ -1068,7 +1068,7 @@ static int __parse_imm_string(char *str, char **pbuf, int offs)
 {
 	size_t len = strlen(str);
 
-	if (str[len - 1] != '"') {
+	if (!len || str[len - 1] != '"') {
 		trace_probe_log_err(offs + len, IMMSTR_NO_CLOSE);
 		return -EINVAL;
 	}