io_uring: fix ignoring xa_store errors

commit a528b04ea40690ff40501f50d618a62a02b19620 upstream.

xa_store() may fail, check the result.

Cc: stable@vger.kernel.org # 5.10
Fixes: 0f2122045b946 ("io_uring: don't rely on weak ->files references")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/io_uring.c b/fs/io_uring.c
index c479121..3dcfd58 100644 (file)
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -8708,10 +8708,9 @@ static void io_uring_cancel_task_requests(struct io_ring_ctx *ctx,
 static int io_uring_add_task_file(struct io_ring_ctx *ctx, struct file *file)
 {
        struct io_uring_task *tctx = current->io_uring;
+       int ret;
 
        if (unlikely(!tctx)) {
-               int ret;
-
                ret = io_uring_alloc_task_context(current);
                if (unlikely(ret))
                        return ret;
@@ -8722,7 +8721,12 @@ static int io_uring_add_task_file(struct io_ring_ctx *ctx, struct file *file)
 
                if (!old) {
                        get_file(file);
-                       xa_store(&tctx->xa, (unsigned long)file, file, GFP_KERNEL);
+                       ret = xa_err(xa_store(&tctx->xa, (unsigned long)file,
+                                               file, GFP_KERNEL));
+                       if (ret) {
+                               fput(file);
+                               return ret;
+                       }
                }
                tctx->last = file;
        }