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io_uring: don't guard IORING_OFF_PBUF_RING with SETUP_NO_MMAP 

commit 6f007b1406637d3d73d42e41d7e8d9b245185e69 upstream.

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: 03d89a2de2 ("io_uring: support for user allocated memory for rings/sqes")
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jens Axboe 2023-11-27 17:08:19 -07:00 committed by Greg Kroah-Hartman
parent 5f1a233efe
commit b797b7f83e
1 changed files with 6 additions and 4 deletions
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10
io_uring/io_uring.c
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@ -3436,16 +3436,18 @@ 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: {