selinux: fix error codes in cond_read_node()

Originally cond_read_node() returned -1 (-EPERM) on errors which was
incorrect.  Now it either propagates the error codes from lower level
functions next_entry() or cond_read_av_list() or it returns -ENOMEM or
-EINVAL.

next_entry() returns -EINVAL.
cond_read_av_list() returns -EINVAL or -ENOMEM.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Acked-by:  Stephen D. Smalley <sds@tycho.nsa.gov>
Signed-off-by: James Morris <jmorris@namei.org>

diff --git a/security/selinux/ss/conditional.c b/security/selinux/ss/conditional.c
index aac40c7..a2b3b29 100644 (file)
--- a/security/selinux/ss/conditional.c
+++ b/security/selinux/ss/conditional.c
@@ -392,24 +392,25 @@ static int cond_read_node(struct policydb *p, struct cond_node *node, void *fp)
        struct cond_expr *expr = NULL, *last = NULL;
 
        rc = next_entry(buf, fp, sizeof(u32));
-       if (rc < 0)
-               return -1;
+       if (rc)
+               return rc;
 
        node->cur_state = le32_to_cpu(buf[0]);
 
        len = 0;
        rc = next_entry(buf, fp, sizeof(u32));
-       if (rc < 0)
-               return -1;
+       if (rc)
+               return rc;
 
        /* expr */
        len = le32_to_cpu(buf[0]);
 
        for (i = 0; i < len; i++) {
                rc = next_entry(buf, fp, sizeof(u32) * 2);
-               if (rc < 0)
+               if (rc)
                        goto err;
 
+               rc = -ENOMEM;
                expr = kzalloc(sizeof(struct cond_expr), GFP_KERNEL);
                if (!expr)
                        goto err;
@@ -418,6 +419,7 @@ static int cond_read_node(struct policydb *p, struct cond_node *node, void *fp)
                expr->bool = le32_to_cpu(buf[1]);
 
                if (!expr_isvalid(p, expr)) {
+                       rc = -EINVAL;
                        kfree(expr);
                        goto err;
                }
@@ -429,14 +431,16 @@ static int cond_read_node(struct policydb *p, struct cond_node *node, void *fp)
                last = expr;
        }
 
-       if (cond_read_av_list(p, fp, &node->true_list, NULL) != 0)
+       rc = cond_read_av_list(p, fp, &node->true_list, NULL);
+       if (rc)
                goto err;
-       if (cond_read_av_list(p, fp, &node->false_list, node->true_list) != 0)
+       rc = cond_read_av_list(p, fp, &node->false_list, node->true_list);
+       if (rc)
                goto err;
        return 0;
 err:
        cond_node_destroy(node);
-       return -1;
+       return rc;
 }
 
 int cond_read_list(struct policydb *p, void *fp)