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io_uring/zcrx: fix area release on registration failure

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On area registration failure there might be no ifq set and it's not safe
to access area->ifq in the release path without checking it first.

Cc: stable@vger.kernel.org
Fixes: f12ecf5e1c ("io_uring/zcrx: fix late dma unmap for a dead dev")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/bc02878678a5fec28bc77d33355cdba735418484.1748365640.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2025-05-27 18:07:33 +01:00 • committed by Jens Axboe
parent eda4623cf9
commit 0ec33c81d9
1 changed files with 2 additions and 1 deletions
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3
io_uring/zcrx.c
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@ -366,7 +366,8 @@ static void io_free_rbuf_ring(struct io_zcrx_ifq *ifq)
static void io_zcrx_free_area(struct io_zcrx_area *area)
{
io_zcrx_unmap_area(area->ifq, area);
if (area->ifq)
io_zcrx_unmap_area(area->ifq, area);
io_release_area_mem(&area->mem);
kvfree(area->freelist);