linux-kernel - [PATCH] dyndbg: fix parsing file query without a line-range suffix

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Message-Id: <20210414212400.2927281-1-giantchen@gmail.com>
Date:   Wed, 14 Apr 2021 14:24:00 -0700
From:   Shuo Chen <giantchen@...il.com>
To:     Jim Cromie <jim.cromie@...il.com>, Jason Baron <jbaron@...mai.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, Shuo Chen <shuochen@...gle.com>
Subject: [PATCH] dyndbg: fix parsing file query without a line-range suffix

From: Shuo Chen <shuochen@...gle.com>

Query like 'file tcp_input.c line 1234 +p' was broken by
commit aaebe329bff0 ("dyndbg: accept 'file foo.c:func1' and 'file
foo.c:10-100'") because a file name without a ':' now makes the loop in
ddebug_parse_query() exits early before parsing the 'line 1234' part.
As a result, all pr_debug() in tcp_input.c will be enabled, instead of only
the one on line 1234.  Changing 'break' to 'continue' fixes this.

Fixes: aaebe329bff0 ("dyndbg: accept 'file foo.c:func1' and 'file foo.c:10-100'")
Signed-off-by: Shuo Chen <shuochen@...gle.com>
---
 lib/dynamic_debug.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index c70d6347afa2..921d0a654243 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -396,7 +396,7 @@ static int ddebug_parse_query(char *words[], int nwords,
 			/* tail :$info is function or line-range */
 			fline = strchr(query->filename, ':');
 			if (!fline)
-				break;
+				continue;
 			*fline++ = '\0';
 			if (isalpha(*fline) || *fline == '*' || *fline == '?') {
 				/* take as function name */
-- 
2.31.1.295.g9ea45b61b8-goog