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[75.142.250.213]) by smtp.gmail.com with ESMTPSA id 69sm17054463qkh.15.2020.06.17.05.40.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 17 Jun 2020 05:40:33 -0700 (PDT) From: trix@redhat.com To: paul@paul-moore.com, stephen.smalley.work@gmail.com, eparis@parisplace.org, omosnace@redhat.com, weiyongjun1@huawei.com Cc: selinux@vger.kernel.org, linux-kernel@vger.kernel.org, Tom Rix Subject: [PATCH] selinux: fix undefined return of cond_evaluate_expr Date: Wed, 17 Jun 2020 05:40:28 -0700 Message-Id: <20200617124028.14130-1-trix@redhat.com> X-Mailer: git-send-email 2.18.1 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Tom Rix clang static analysis reports an undefined return security/selinux/ss/conditional.c:79:2: warning: Undefined or garbage value returned to caller [core.uninitialized.UndefReturn] return s[0]; ^~~~~~~~~~~ static int cond_evaluate_expr( ... { u32 i; int s[COND_EXPR_MAXDEPTH]; for (i = 0; i < expr->len; i++) ... return s[0]; When expr->len is 0, the loop which sets s[0] never runs. So return -1 if the loop never runs. Signed-off-by: Tom Rix --- security/selinux/ss/conditional.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/security/selinux/ss/conditional.c b/security/selinux/ss/conditional.c index 450bc02f4cd2..0cc7cdd58465 100644 --- a/security/selinux/ss/conditional.c +++ b/security/selinux/ss/conditional.c @@ -27,6 +27,9 @@ static int cond_evaluate_expr(struct policydb *p, struct cond_expr *expr) int s[COND_EXPR_MAXDEPTH]; int sp = -1; + if (expr->len == 0) + return -1; + for (i = 0; i < expr->len; i++) { struct cond_expr_node *node = &expr->nodes[i]; -- 2.18.1