[PATCH 5.10 519/717] io_uring: fix ignoring xa_store errors

[Greg Kroah-Hartman]

From: Pavel Begunkov <asml.sile...@gmail.com>

commit a528b04ea40690ff40501f50d618a62a02b19620 upstream.

xa_store() may fail, check the result.

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

---
 fs/io_uring.c |   10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -8708,10 +8708,9 @@ static void io_uring_cancel_task_request
 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
 
                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;
        }