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io_uring: clean rings on NO_MMAP alloc fail

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[ Upstream commit cef59d1ea7 ]

We make a few cancellation judgements based on ctx->rings, so let's
zero it afer deallocation for IORING_SETUP_NO_MMAP just like it's
done with the mmap case. Likely, it's not a real problem, but zeroing
is safer and better tested.

Cc: stable@vger.kernel.org
Fixes: 03d89a2de2 ("io_uring: support for user allocated memory for rings/sqes")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/9ff6cdf91429b8a51699c210e1f6af6ea3f8bdcf.1710255382.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Pavel Begunkov 2024-03-12 14:56:27 +00:00 committed by Greg Kroah-Hartman
parent 94f75938cd
commit f81532bd01
1 changed files with 3 additions and 2 deletions
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5
io_uring/io_uring.c
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@ -2757,14 +2757,15 @@ static void io_rings_free(struct io_ring_ctx *ctx)
if (!(ctx->flags & IORING_SETUP_NO_MMAP)) {
io_mem_free(ctx->rings);
io_mem_free(ctx->sq_sqes);
ctx->rings = NULL;
ctx->sq_sqes = NULL;
} else {
io_pages_free(&ctx->ring_pages, ctx->n_ring_pages);
ctx->n_ring_pages = 0;
io_pages_free(&ctx->sqe_pages, ctx->n_sqe_pages);
ctx->n_sqe_pages = 0;
}
ctx->rings = NULL;
ctx->sq_sqes = NULL;
}
void *io_mem_alloc(size_t size)