From: Jens Axboe Date: Tue, 28 Nov 2023 00:08:19 +0000 (-0700) Subject: io_uring: don't guard IORING_OFF_PBUF_RING with SETUP_NO_MMAP X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=6f007b1406637d3d73d42e41d7e8d9b245185e69;p=linux.git io_uring: don't guard IORING_OFF_PBUF_RING with SETUP_NO_MMAP This flag only applies to the SQ and CQ rings, it's perfectly valid to use a mmap approach for the provided ring buffers. Move the check into where it belongs. Cc: stable@vger.kernel.org Fixes: 03d89a2de25b ("io_uring: support for user allocated memory for rings/sqes") Signed-off-by: Jens Axboe --- diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index b45abfd75415d..52e4b14ad8aab 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -3478,16 +3478,18 @@ static void *io_uring_validate_mmap_request(struct file *file, struct page *page; void *ptr; - /* Don't allow mmap if the ring was setup without it */ - if (ctx->flags & IORING_SETUP_NO_MMAP) - return ERR_PTR(-EINVAL); - switch (offset & IORING_OFF_MMAP_MASK) { case IORING_OFF_SQ_RING: case IORING_OFF_CQ_RING: + /* Don't allow mmap if the ring was setup without it */ + if (ctx->flags & IORING_SETUP_NO_MMAP) + return ERR_PTR(-EINVAL); ptr = ctx->rings; break; case IORING_OFF_SQES: + /* Don't allow mmap if the ring was setup without it */ + if (ctx->flags & IORING_SETUP_NO_MMAP) + return ERR_PTR(-EINVAL); ptr = ctx->sq_sqes; break; case IORING_OFF_PBUF_RING: {