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io_uring/zcrx: poison pointers on unregistration

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Nobody should be touching area and other pointers after zcrx
destruction, poison them instead of zeroing.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://patch.msgid.link/19112d1412539dcfc04a0317b5812e968623bc51.1779189667.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2026-05-19 12:44:28 +01:00 committed by Jens Axboe
parent 74fc9a9b50
commit e57b44039b
1 changed files with 5 additions and 6 deletions
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11
io_uring/zcrx.c
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@ -245,14 +245,13 @@ static void io_release_area_mem(struct io_zcrx_mem *mem)
{
if (mem->is_dmabuf) {
io_release_dmabuf(mem);
return;
}
if (mem->pages) {
} else if (mem->pages) {
unpin_user_pages(mem->pages, mem->nr_folios);
sg_free_table(mem->sgt);
mem->sgt = NULL;
kvfree(mem->pages);
}
mem->pages = IO_URING_PTR_POISON;
mem->sgt = IO_URING_PTR_POISON;
}
static int io_import_area(struct io_zcrx_ifq *ifq,
@ -403,8 +402,8 @@ static int io_allocate_rbuf_ring(struct io_ring_ctx *ctx,
static void io_free_rbuf_ring(struct io_zcrx_ifq *ifq)
{
io_free_region(ifq->user, &ifq->rq_region);
ifq->rq.ring = NULL;
ifq->rq.rqes = NULL;
ifq->rq.ring = IO_URING_PTR_POISON;
ifq->rq.rqes = IO_URING_PTR_POISON;
}
static void io_zcrx_free_area(struct io_zcrx_ifq *ifq,