io_uring: verify that resv2 is 0 in io_uring_rsrc_update2

Verify that the user does not pass in anything but 0 for this field.

Fixes: 992da01aa932 ("io_uring: change registration/upd/rsrc tagging ABI")
Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220412163042.2788062-3-dylany@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 58bfa71..e899192 100644 (file)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -6839,6 +6839,7 @@ static int io_files_update(struct io_kiocb *req, unsigned int issue_flags)
        up.nr = 0;
        up.tags = 0;
        up.resv = 0;
+       up.resv2 = 0;
 
        io_ring_submit_lock(ctx, needs_lock);
        ret = __io_register_rsrc_update(ctx, IORING_RSRC_FILE,
@@ -11423,7 +11424,7 @@ static int io_register_files_update(struct io_ring_ctx *ctx, void __user *arg,
        memset(&up, 0, sizeof(up));
        if (copy_from_user(&up, arg, sizeof(struct io_uring_rsrc_update)))
                return -EFAULT;
-       if (up.resv)
+       if (up.resv || up.resv2)
                return -EINVAL;
        return __io_register_rsrc_update(ctx, IORING_RSRC_FILE, &up, nr_args);
 }
@@ -11437,7 +11438,7 @@ static int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg,
                return -EINVAL;
        if (copy_from_user(&up, arg, sizeof(up)))
                return -EFAULT;
-       if (!up.nr || up.resv)
+       if (!up.nr || up.resv || up.resv2)
                return -EINVAL;
        return __io_register_rsrc_update(ctx, type, &up, up.nr);
 }