[PATCH 5.15 031/244] apparmor: fix aa_label_asxprint return check

Greg Kroah-Hartman
2022-08-23T09:42:00Z

From: Tom Rix <trix@redhat.com>

commit 3e2a3a0830a2090e766d0d887d52c67de2a6f323 upstream.

Clang static analysis reports this issue
label.c:1802:3: warning: 2nd function call argument
is an uninitialized value
pr_info("%s", str);
^~~~~~~~~~~~~~~~~~

str is set from a successful call to aa_label_asxprint(&str, ...)
On failure a negative value is returned, not a -1. So change
the check.

Fixes: f1bd904175e8 ("apparmor: add the base fns() for domain labels")
Signed-off-by: Tom Rix <trix@redhat.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
security/apparmor/label.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

--- a/security/apparmor/label.c
+++ b/security/apparmor/label.c
@@ -1745,7 +1745,7 @@ void aa_label_xaudit(struct audit_buffer
if (!use_label_hname(ns, label, flags) ||
display_mode(ns, label, flags)) {
len = aa_label_asxprint(&name, ns, label, flags, gfp);
- if (len == -1) {
+ if (len < 0) {
AA_DEBUG("label print error");
return;
}
@@ -1773,7 +1773,7 @@ void aa_label_seq_xprint(struct seq_file
int len;

len = aa_label_asxprint(&str, ns, label, flags, gfp);
- if (len == -1) {
+ if (len < 0) {
AA_DEBUG("label print error");
return;
}
@@ -1796,7 +1796,7 @@ void aa_label_xprintk(struct aa_ns *ns,
int len;

len = aa_label_asxprint(&str, ns, label, flags, gfp);
- if (len == -1) {
+ if (len < 0) {
AA_DEBUG("label print error");
return;
}