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io_uring: mem-account pbuf buckets 

commit cc18cc5e82 upstream.

Potentially, someone may create as many pbuf bucket as there are indexes
in an xarray without any other restrictions bounding our memory usage,
put memory needed for the buckets under memory accounting.

Cc: <stable@vger.kernel.org>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/d34c452e45793e978d26e2606211ec9070d329ea.1659622312.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pavel Begunkov 2022-08-04 15:13:46 +01:00 committed by Greg Kroah-Hartman
parent 0f63e33eca
commit e0f4fe9c63
1 changed files with 1 additions and 1 deletions
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2
io_uring/io_uring.c
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@ -4927,7 +4927,7 @@ static int io_provide_buffers(struct io_kiocb *req, unsigned int issue_flags)
bl = io_buffer_get_list(ctx, p->bgid);
if (unlikely(!bl)) {
bl = kmalloc(sizeof(*bl), GFP_KERNEL);
bl = kzalloc(sizeof(*bl), GFP_KERNEL_ACCOUNT);
if (!bl) {
ret = -ENOMEM;
goto err;