libc: stream adds length check

Signed-off-by: yinshengkai <yinshengkai@xiaomi.com>
2023-03-13 22:42:00 +08:00 · 2023-03-13 22:42:00 +08:00 · ca290e85ea
parent 1c9c6e94f0
commit ca290e85ea
1 changed files with 5 additions and 0 deletions
--- a/libs/libc/stream/lib_syslogstream.c
+++ b/libs/libc/stream/lib_syslogstream.c
@ -200,6 +200,11 @@ static int syslogstream_puts(FAR struct lib_outstream_s *this,
  int ret = 0;

  DEBUGASSERT(stream != NULL);
+  if (len <= 0)
+    {
+      return 0;
+    }
+
  stream->last_ch = ((FAR const char *)buff)[len -1];

 #ifdef CONFIG_SYSLOG_BUFFER