From: Changbin Du <changbin.du@intel.com>
Date: Tue, 16 Jan 2018 09:02:29 +0000 (+0800)
Subject: tracing: Clear parser->idx if only spaces are read
X-Git-Tag: v5.15~9416^2~10
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=76638d96502744b0d593f2386b75ae5a017c13bb;p=platform%2Fkernel%2Flinux-starfive.git

tracing: Clear parser->idx if only spaces are read

If only spaces were read while parsing the next string, then parser->idx should be
cleared in order to make trace_parser_loaded() return false.

Link: http://lkml.kernel.org/r/1516093350-12045-3-git-send-email-changbin.du@intel.com

Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Changbin Du <changbin.du@intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index c00a31d18f8a..cb90435e63da 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1236,14 +1236,14 @@ int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
 			cnt--;
 		}
 
+		parser->idx = 0;
+
 		/* only spaces were written */
 		if (isspace(ch) || !ch) {
 			*ppos += read;
 			ret = read;
 			goto out;
 		}
-
-		parser->idx = 0;
 	}
 
 	/* read the non-space input */