sanitize audit_mq_open()
* don't bother with allocations
* don't do double copy_from_user()
* don't duplicate parts of check for audit_dummy_context()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 192da80..d448b69 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -588,22 +588,18 @@
* Invoked when creating a new queue via sys_mq_open
*/
static struct file *do_create(struct dentry *dir, struct dentry *dentry,
- int oflag, mode_t mode, struct mq_attr __user *u_attr)
+ int oflag, mode_t mode, struct mq_attr *attr)
{
const struct cred *cred = current_cred();
- struct mq_attr attr;
struct file *result;
int ret;
- if (u_attr) {
- ret = -EFAULT;
- if (copy_from_user(&attr, u_attr, sizeof(attr)))
- goto out;
+ if (attr) {
ret = -EINVAL;
- if (!mq_attr_ok(&attr))
+ if (!mq_attr_ok(attr))
goto out;
/* store for use during create */
- dentry->d_fsdata = &attr;
+ dentry->d_fsdata = attr;
}
mode &= ~current->fs->umask;
@@ -660,11 +656,13 @@
struct dentry *dentry;
struct file *filp;
char *name;
+ struct mq_attr attr;
int fd, error;
- error = audit_mq_open(oflag, mode, u_attr);
- if (error != 0)
- return error;
+ if (u_attr && copy_from_user(&attr, u_attr, sizeof(struct mq_attr)))
+ return -EFAULT;
+
+ audit_mq_open(oflag, mode, u_attr ? &attr : NULL);
if (IS_ERR(name = getname(u_name)))
return PTR_ERR(name);
@@ -690,7 +688,8 @@
filp = do_open(dentry, oflag);
} else {
filp = do_create(mqueue_mnt->mnt_root, dentry,
- oflag, mode, u_attr);
+ oflag, mode,
+ u_attr ? &attr : NULL);
}
} else {
error = -ENOENT;