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apparmor: fix error check 

[ Upstream commit d108370c644b153382632b3e5511ade575c91c86 ]

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: f1bd904175 ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Tom Rix 2020-10-04 07:24:22 -07:00 committed by Greg Kroah-Hartman
parent a7b2947649
commit bd48bdbfd9
1 changed files with 2 additions and 2 deletions
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4
security/apparmor/label.c
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@ -1459,7 +1459,7 @@ 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);
@ -1709,7 +1709,7 @@ 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