linux-kernel - [PATCH 4.9 126/148] dynamic-debug-howto: fix optional/omitted ending line number to be LARGE instead of 0

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Date:   Tue, 12 Dec 2017 13:45:36 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Randy Dunlap <rdunlap@...radead.org>,
        Jason Baron <jbaron@...mai.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.9 126/148] dynamic-debug-howto: fix optional/omitted ending line number to be LARGE instead of 0

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Randy Dunlap <rdunlap@...radead.org>


[ Upstream commit 1f3c790bd5989fcfec9e53ad8fa09f5b740c958f ]

line-range is supposed to treat "1-" as "1-endoffile", so
handle the special case by setting last_lineno to UINT_MAX.

Fixes this error:

  dynamic_debug:ddebug_parse_query: last-line:0 < 1st-line:1
  dynamic_debug:ddebug_exec_query: query parse failed

Link: http://lkml.kernel.org/r/10a6a101-e2be-209f-1f41-54637824788e@infradead.org
Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Acked-by: Jason Baron <jbaron@...mai.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 lib/dynamic_debug.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -360,6 +360,10 @@ static int ddebug_parse_query(char *word
 				if (parse_lineno(last, &query->last_lineno) < 0)
 					return -EINVAL;
 
+				/* special case for last lineno not specified */
+				if (query->last_lineno == 0)
+					query->last_lineno = UINT_MAX;
+
 				if (query->last_lineno < query->first_lineno) {
 					pr_err("last-line:%d < 1st-line:%d\n",
 						query->last_lineno,