linux-kernel - [PATCH v1 0/2] USB: Fixes for handling ITER

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Date:   Sat,  1 Apr 2023 06:05:07 +0000
From:   Sandeep Dhavale <dhavale@...gle.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...nel.dk>
Cc:     Sandeep Dhavale <dhavale@...gle.com>, kernel-team@...roid.com,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v1 0/2] USB: Fixes for handling ITER_UBUF

Since the commit 1e23db450cff ("io_uring: use iter_ubuf for single range
imports") .read_iter() can be called with iov type ITER_UBUF.
In such case dup_iter() will correctly dup but it will not allocate
any memory. But callers ffs_epfile_read_iter and ep_read_iter treat
this as a failure.

Following patches address this by checking if iter_is_ubuf().
Without the fix, async IOs from io_uring will be returned with -ENOMEM.

Sandeep Dhavale (2):
  usb: gadget: f_fs: Fix ffs_epfile_read_iter to handle ITER_UBUF
  usb: gadgetfs: Fix ep_read_iter to handle ITER_UBUF

 drivers/usb/gadget/function/f_fs.c | 2 +-
 drivers/usb/gadget/legacy/inode.c  | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

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2.40.0.348.gf938b09366-goog