io_uring/zcrx: fix sgtable leak on mapping failures

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[ Upstream commit a983aae397 ]

In an unlikely case when io_populate_area_dma() fails, which could only
happen on a PAGE_POOL_32BIT_ARCH_WITH_64BIT_DMA machine,
io_zcrx_map_area() will have an initialised and not freed table. It was
supposed to be cleaned up in the error path, but !is_mapped prevents
that.

Fixes: 439a98b972 ("io_uring/zcrx: deduplicate area mapping")
Cc: stable@vger.kernel.org
Reported-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Pavel Begunkov 2026-02-14 22:19:32 +00:00 • committed by Sasha Levin

parent bcf40ce466

commit f1ae403324

1 changed files with 3 additions and 0 deletions

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io_uring/zcrx.c

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