[PATCH 5.15 52/98] io_uring: ensure that send/sendmsg and recv/recvmsg check sqe->ioprio

Greg Kroah-Hartman
2022-07-05T12:24:33Z

From: Jens Axboe <axboe@kernel.dk>

commit 73911426aaaadbae54fa72359b33a7b6a56947db upstream.

All other opcodes correctly check if this is set and -EINVAL if it is
and they don't support that field, for some reason the these were
forgotten.

This was unified a bit differently in the upstream tree, but had the
same effect as making sure we error on this field. Rather than have
a painful backport of the upstream commit, just fixup the mentioned
opcodes.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/io_uring.c | 4 ++++
1 file changed, 4 insertions(+)

--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -4788,6 +4788,8 @@ static int io_sendmsg_prep(struct io_kio
return -EINVAL;
if (unlikely(sqe->addr2 || sqe->file_index))
return -EINVAL;
+ if (unlikely(sqe->addr2 || sqe->file_index || sqe->ioprio))
+ return -EINVAL;

sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr));
sr->len = READ_ONCE(sqe->len);
@@ -5011,6 +5013,8 @@ static int io_recvmsg_prep(struct io_kio
return -EINVAL;
if (unlikely(sqe->addr2 || sqe->file_index))
return -EINVAL;
+ if (unlikely(sqe->addr2 || sqe->file_index || sqe->ioprio))
+ return -EINVAL;

sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr));
sr->len = READ_ONCE(sqe->len);