tree 4db44a68993f532093236a4e0692f3ce79241fce
parent ce765372bc443573d1d339a2bf4995de385dea3a
author Matthew Wilcox (Oracle) <willy@infradead.org> 1602247792 +0100
committer Jens Axboe <axboe@kernel.dk> 1602255580 -0600

io_uring: Fix XArray usage in io_uring_add_task_file

The xas_store() wasn't paired with an xas_nomem() loop, so if it couldn't
allocate memory using GFP_NOWAIT, it would leak the reference to the file
descriptor.  Also the node pointed to by the xas could be freed between
the call to xas_load() under the rcu_read_lock() and the acquisition of
the xa_lock.

It's easier to just use the normal xa_load/xa_store interface here.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
[axboe: fix missing assign after alloc, cur_uring -> tctx rename]
Signed-off-by: Jens Axboe <axboe@kernel.dk>