diff options
| -rw-r--r-- | fs/io_uring.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/fs/io_uring.c b/fs/io_uring.c index 8fc3dd49bc04..0bc5fbf64e49 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -12157,9 +12157,11 @@ static int io_register_pbuf_ring(struct io_ring_ctx *ctx, void __user *arg) } bl = io_buffer_get_list(ctx, reg.bgid); - if (bl && bl->buf_nr_pages) - return -EEXIST; - if (!bl) { + if (bl) { + /* if mapped buffer ring OR classic exists, don't allow */ + if (bl->buf_nr_pages || !list_empty(&bl->buf_list)) + return -EEXIST; + } else { bl = kzalloc(sizeof(*bl), GFP_KERNEL); if (!bl) return -ENOMEM; |