tree 5b09113e51b22b53ac51c24ae077869a83f0fa75
parent 31a852343550ac6012872e47e53a4d2e8e2f4f13
author Pavel Begunkov <asml.silence@gmail.com> 1739208475 +0000
committer COS Cherry Picker <cloud-image-release@prod.google.com> 1740347865 -0800

io_uring: fix io_req_prep_async with provided buffers

io_req_prep_async() can import provided buffers, commit the ring state
by giving up on that before, it'll be reimported later if needed.

BUG=b/397181083
TEST=None
RELEASE_NOTE=None

cos-patch: security-high
Reported-by: Muhammad Ramdhan <ramdhan@starlabs.sg>
Reported-by: Bing-Jhong Billy Jheng <billy@starlabs.sg>
Reported-by: Jacob Soo <jacob.soo@starlabs.sg>
Fixes: c7fb19428d67d ("io_uring: add support for ring mapped supplied buffers")
Change-Id: I6cba13e5583da45b772b8b42e3d7fe380be9d243
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-on: https://cos-review.googlesource.com/c/third_party/kernel/+/93820
Main-Branch-Verified: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Reviewed-by: Anil Altinay <aaltinay@google.com>