io_uring: fix mis-seting personality's creds

After io_identity_cow() copies an work.identity it wants to copy creds
to the new just allocated id, not the old one. Otherwise it's
akin to req->work.identity->creds = req->work.identity->creds.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/fs/io_uring.c b/fs/io_uring.c
index a2a7c65a77aa92d09ec4dfd9d1b65535dfaf2b04..908817cea4f54a7bde52b483f4c18c5c728ddc10 100644 (file)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1284,7 +1284,7 @@ static bool io_identity_cow(struct io_kiocb *req)
         */
        io_init_identity(id);
        if (creds)
-               req->work.identity->creds = creds;
+               id->creds = creds;
 
        /* add one for this request */
        refcount_inc(&id->count);