1 files changed, 64 insertions, 30 deletions

diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 2a77b14fee2..5e3229c797f 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -141,33 +141,62 @@ out:
 /*
  * Decrement ima counts
  */
-static void ima_dec_counts(struct ima_iint_cache *iint, struct inode *inode,
-                           struct file *file)
+static void ima_dec_counts(struct inode *inode, struct file *file)
 {
         mode_t mode = file->f_mode;
-        bool dump = false;
 
-        BUG_ON(!mutex_is_locked(&iint->mutex));
         assert_spin_locked(&inode->i_lock);
 
         if ((mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) {
-                if (unlikely(inode->i_readcount == 0))
-                        dump = true;
+                if (unlikely(inode->i_readcount == 0)) {
+                        if (!ima_limit_imbalance(file)) {
+                                printk(KERN_INFO "%s: open/free imbalance (r:%u)\n",
+                                       __func__, inode->i_readcount);
+                                dump_stack();
+                        }
+                        return;
+                }
                 inode->i_readcount--;
         }
-        if (mode & FMODE_WRITE) {
-                if (atomic_read(&inode->i_writecount) <= 0)
-                        dump = true;
-                if (atomic_read(&inode->i_writecount) == 1 &&
-                    iint->version != inode->i_version)
-                        iint->flags &= ~IMA_MEASURED;
-        }
+}
 
-        if (dump && !ima_limit_imbalance(file)) {
-                printk(KERN_INFO "%s: open/free imbalance (r:%u)\n",
-                       __func__, inode->i_readcount);
-                dump_stack();
-        }
+static void ima_check_last_writer(struct ima_iint_cache *iint,
+                                  struct inode *inode,
+                                  struct file *file)
+{
+        mode_t mode = file->f_mode;
+
+        BUG_ON(!mutex_is_locked(&iint->mutex));
+        assert_spin_locked(&inode->i_lock);
+
+        if (mode & FMODE_WRITE &&
+            atomic_read(&inode->i_writecount) == 1 &&
+            iint->version != inode->i_version)
+                iint->flags &= ~IMA_MEASURED;
+}
+
+static void ima_file_free_iint(struct ima_iint_cache *iint, struct inode *inode,
+                               struct file *file)
+{
+        mutex_lock(&iint->mutex);
+        spin_lock(&inode->i_lock);
+
+        ima_dec_counts(inode, file);
+        ima_check_last_writer(iint, inode, file);
+
+        spin_unlock(&inode->i_lock);
+        mutex_unlock(&iint->mutex);
+
+        kref_put(&iint->refcount, iint_free);
+}
+
+static void ima_file_free_noiint(struct inode *inode, struct file *file)
+{
+        spin_lock(&inode->i_lock);
+
+        ima_dec_counts(inode, file);
+
+        spin_unlock(&inode->i_lock);
 }
 
 /**
@@ -175,7 +204,7 @@ static void ima_dec_counts(struct ima_iint_cache *iint, struct inode *inode,
  * @file: pointer to file structure being freed
  *
  * Flag files that changed, based on i_version;
- * and decrement the iint readcount/writecount.
+ * and decrement the i_readcount.
  */
 void ima_file_free(struct file *file)
 {
@@ -185,17 +214,12 @@ void ima_file_free(struct file *file)
         if (!iint_initialized || !S_ISREG(inode->i_mode))
                 return;
         iint = ima_iint_find_get(inode);
-        if (!iint)
-                return;
 
-        mutex_lock(&iint->mutex);
-        spin_lock(&inode->i_lock);
-
-        ima_dec_counts(iint, inode, file);
+        if (iint)
+                ima_file_free_iint(iint, inode, file);
+        else
+                ima_file_free_noiint(inode, file);
 
-        spin_unlock(&inode->i_lock);
-        mutex_unlock(&iint->mutex);
-        kref_put(&iint->refcount, iint_free);
 }
 
 static int process_measurement(struct file *file, const unsigned char *filename,
@@ -207,11 +231,21 @@ static int process_measurement(struct file *file, const unsigned char *filename,
 
         if (!ima_initialized || !S_ISREG(inode->i_mode))
                 return 0;
+
+        rc = ima_must_measure(NULL, inode, mask, function);
+        if (rc != 0)
+                return rc;
+retry:
         iint = ima_iint_find_get(inode);
-        if (!iint)
-                return -ENOMEM;
+        if (!iint) {
+                rc = ima_inode_alloc(inode);
+                if (!rc || rc == -EEXIST)
+                        goto retry;
+                return rc;
+        }
 
         mutex_lock(&iint->mutex);
+
         rc = ima_must_measure(iint, inode, mask, function);
         if (rc != 0)
                 goto out;