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usb: gadgetfs: Fix ep_read_iter to handle ITER_UBUF 

iov_iter for ep_read_iter can be ITER_UBUF with io_uring.
In that case dup_iter() does not have to allocate iov and it can
return NULL. Fix the assumption by checking for iter_is_ubuf()
other wise ep_read_iter can treat this as failure and return -ENOMEM.

Fixes: 1e23db450c ("io_uring: use iter_ubuf for single range imports")
Signed-off-by: Sandeep Dhavale <dhavale@google.com>
Acked-by: Jens Axboe <axboe@kernel.dk>
Link: https://lore.kernel.org/r/20230401060509.3608259-3-dhavale@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sandeep Dhavale 2023-04-01 06:05:09 +00:00 committed by Greg Kroah-Hartman
parent d356b3cdd0
commit e07fec475c
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/gadget/legacy/inode.c
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@ -614,7 +614,7 @@ ep_read_iter(struct kiocb *iocb, struct iov_iter *to)
if (!priv)
goto fail;
priv->to_free = dup_iter(&priv->to, to, GFP_KERNEL);
if (!priv->to_free) {
if (!iter_is_ubuf(&priv->to) && !priv->to_free) {
kfree(priv);
goto fail;
}