io_uring: protect mem region deregistration

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commit be7cab44ed upstream.

io_create_region_mmap_safe() protects publishing of a region against
concurrent mmap calls, however we should also protect against it when
removing a region. There is a gap io_register_mem_region() where it
safely publishes a region, but then copy_to_user goes wrong and it
unsafely frees the region.

Cc: stable@vger.kernel.org
Fixes: 087f997870 ("io_uring/memmap: implement mmap for regions")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Pavel Begunkov 2025-10-15 13:07:23 +01:00 • committed by Greg Kroah-Hartman

parent a11c61fa0b

commit 79dd6f032e

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io_uring/register.c

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