io_uring/rsrc: use nospec'ed indexes

[ Upstream commit 953c37e066f05a3dca2d74643574b8dfe8a83983 ]

We use array_index_nospec() for registered buffer indexes, but don't use
it while poking into rsrc tags, fix that.

Fixes: 634d00df5e1cf ("io_uring: add full-fledged dynamic buffers support")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/f02fafc5a9c0dd69be2b0618c38831c078232ff0.1681395792.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/io_uring/rsrc.c b/io_uring/rsrc.c
index 4426d0e..cce9516 100644 (file)
--- a/io_uring/rsrc.c
+++ b/io_uring/rsrc.c
@@ -562,7 +562,7 @@ static int __io_sqe_buffers_update(struct io_ring_ctx *ctx,
                }
 
                ctx->user_bufs[i] = imu;
-               *io_get_tag_slot(ctx->buf_data, offset) = tag;
+               *io_get_tag_slot(ctx->buf_data, i) = tag;
        }
 
        if (needs_switch)