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io_uring: mem-account pbuf buckets

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commit cc18cc5e82033d406f54144ad6f8092206004684 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 50446ac345
commit fa3040688d
1 changed files with 2 additions and 1 deletions
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3
fs/io_uring.c
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@ -4477,7 +4477,8 @@ static int io_provide_buffers(struct io_kiocb *req, unsigned int issue_flags)
ret = io_add_buffers(p, &head);
if (ret >= 0 && !list) {
ret = xa_insert(&ctx->io_buffers, p->bgid, head, GFP_KERNEL);
ret = xa_insert(&ctx->io_buffers, p->bgid, head,
GFP_KERNEL_ACCOUNT);
if (ret < 0)
__io_remove_buffers(ctx, head, p->bgid, -1U);
}