linux-kernel - [PATCH 5.10 005/299] dyndbg: fix parsing file query without a line-range suffix

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Date:   Mon, 10 May 2021 12:16:42 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Eric Dumazet <edumazet@...gle.com>,
        Shuo Chen <shuochen@...gle.com>,
        Jason Baron <jbaron@...mai.com>
Subject: [PATCH 5.10 005/299] dyndbg: fix parsing file query without a line-range suffix

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

commit 7b1ae248279bea33af9e797a93c35f49601cb8a0 upstream.

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'")
Cc: stable <stable@...r.kernel.org>
Reviewed-by: Eric Dumazet <edumazet@...gle.com>
Signed-off-by: Shuo Chen <shuochen@...gle.com>
Acked-by: Jason Baron <jbaron@...mai.com>
Link: https://lore.kernel.org/r/20210414212400.2927281-1-giantchen@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 lib/dynamic_debug.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -396,7 +396,7 @@ static int ddebug_parse_query(char *word
 			/* 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 */