linux-kernel - [PATCH v2] bootconfig: Initialize ret in xbc_parse

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <20211027105753.6ab9da5f@gandalf.local.home>
Date:   Wed, 27 Oct 2021 10:57:53 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: [PATCH v2] bootconfig: Initialize ret in xbc_parse_tree()

From: "Steven Rostedt (VMware)" <rostedt@...dmis.org>

The do while loop continues while ret is zero, but ret is never
initialized. The check for ret in the loop at the while should always be
initialized, but if an empty string were to be passed in, q would be NULL
and p would be '\0', and it would break out of the loop without ever
setting ret.

Set ret to zero, and then xbc_verify_tree() would be called and catch that
it is an empty tree and report the proper error.

Fixes: bdac5c2b243f ("bootconfig: Allocate xbc_data inside xbc_init()")
Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Andrew Morton <akpm@...ux-foundation.org>
Acked-by: Masami Hiramatsu <mhiramat@...nel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
---
Changes since v1:
   https://lkml.kernel.org/r/20211027095512.3da02311@gandalf.local.home
   - Just updated the Fixes tag and removed Cc to stable


 lib/bootconfig.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/bootconfig.c b/lib/bootconfig.c
index a10ab25f6fcc..70e0d52ffd24 100644
--- a/lib/bootconfig.c
+++ b/lib/bootconfig.c
@@ -836,7 +836,7 @@ static int __init xbc_verify_tree(void)
 static int __init xbc_parse_tree(void)
 {
 	char *p, *q;
-	int ret, c;
+	int ret = 0, c;
 
 	last_parent = NULL;
 	p = xbc_data;
-- 
2.31.1