From d108370c644b153382632b3e5511ade575c91c86 Mon Sep 17 00:00:00 2001
From: Tom Rix <trix@redhat.com>
Date: Sun, 4 Oct 2020 07:24:22 -0700
Subject: [PATCH] apparmor: fix error check
Git-commit: d108370c644b153382632b3e5511ade575c91c86
Patch-mainline: v5.16-rc1
References: git-fixes stable-5.14.19
clang static analysis reports this representative problem:
label.c:1463:16: warning: Assigned value is garbage or undefined
label->hname = name;
^ ~~~~
In aa_update_label_name(), this the problem block of code
if (aa_label_acntsxprint(&name, ...) == -1)
return res;
On failure, aa_label_acntsxprint() has a more complicated return
that just -1. So check for a negative return.
It was also noted that the aa_label_acntsxprint() main comment refers
to a nonexistent parameter, so clean up the comment.
Fixes: f1bd904175e8 ("apparmor: add the base fns() for domain labels")
Signed-off-by: Tom Rix <trix@redhat.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
security/apparmor/label.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/security/apparmor/label.c b/security/apparmor/label.c
index 23f7a193df4f..f5eb9ac07e9b 100644
--- a/security/apparmor/label.c
+++ b/security/apparmor/label.c
@@ -1453,7 +1453,7 @@ bool aa_update_label_name(struct aa_ns *ns, struct aa_label *label, gfp_t gfp)
if (label->hname || labels_ns(label) != ns)
return res;
- if (aa_label_acntsxprint(&name, ns, label, FLAGS_NONE, gfp) == -1)
+ if (aa_label_acntsxprint(&name, ns, label, FLAGS_NONE, gfp) < 0)
return res;
ls = labels_set(label);
@@ -1703,7 +1703,7 @@ int aa_label_asxprint(char **strp, struct aa_ns *ns, struct aa_label *label,
/**
* aa_label_acntsxprint - allocate a __counted string buffer and print label
- * @strp: buffer to write to. (MAY BE NULL if @size == 0)
+ * @strp: buffer to write to.
* @ns: namespace profile is being viewed from
* @label: label to view (NOT NULL)
* @flags: flags controlling what label info is printed
--
2.26.2