[PATCH] aio: Check for aio_flags

[Goldwyn Rodrigues <rgoldwyn@xxxxxxx>]

From: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx>

aio_flags are not checked when performing io_submit() and
can contain non-conforming values.
Return -EINVAL if they are invalid.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx>

diff --git a/fs/aio.c b/fs/aio.c
index 428484f..f2dd175 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -1521,6 +1521,11 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
 		return -EINVAL;
 	}
 
+	if (unlikely(iocb->aio_flags & ~IOCB_FLAG_RESFD)) {
+		pr_debug("EINVAL: incorrect flags\n");
+		return -EINVAL;
+	}
+
 	req = aio_get_req(ctx);
 	if (unlikely(!req))
 		return -EAGAIN;