lkml.org 
[lkml]   [2022]   [Feb]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 5/5] selinux: drop unnecessary NULL check
Date
Commit e3489f8974e1 ("selinux: kill selinux_sb_get_mnt_opts()")
introduced a NULL check on the context after a successful call to
security_sid_to_context(). This is on the one hand redundant after
checking for success and on the other hand insufficient on an actual
NULL pointer, since the context is passed to seq_escape() leading to a
call of strlen() on it.

Reported by Clang analyzer:

In file included from security/selinux/hooks.c:28:
In file included from ./include/linux/tracehook.h:50:
In file included from ./include/linux/memcontrol.h:13:
In file included from ./include/linux/cgroup.h:18:
./include/linux/seq_file.h:136:25: warning: Null pointer passed as 1st argument to string length function [unix.cstring.NullArg]
seq_escape_mem(m, src, strlen(src), flags, esc);
^~~~~~~~~~~

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
---
security/selinux/hooks.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 1e69f88eb326..ac802b99d36c 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -1020,7 +1020,7 @@ static int show_sid(struct seq_file *m, u32 sid)
rc = security_sid_to_context(&selinux_state, sid,
&context, &len);
if (!rc) {
- bool has_comma = context && strchr(context, ',');
+ bool has_comma = strchr(context, ',');

seq_putc(m, '=');
if (has_comma)
--
2.35.1
\
 
 \ /
  Last update: 2022-02-17 15:22    [W:0.150 / U:1.020 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site