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io_uring/rsrc: fix rogue rsrc node grabbing
We should not be looking at ctx->rsrc_node and anyhow modifying the node
without holding uring_lock, grabbing references in such a way is not
safe either.
Cc: stable@vger.kernel.org
Fixes: 5106dd6e74
("io_uring: propagate issue_flags state down to file assignment")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/1202ede2d7bb90136e3482b2b84aad9ed483e5d6.1680098433.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
parent
005308f7bd
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@ -144,15 +144,13 @@ static inline void io_req_set_rsrc_node(struct io_kiocb *req,
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unsigned int issue_flags)
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{
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if (!req->rsrc_node) {
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io_ring_submit_lock(ctx, issue_flags);
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lockdep_assert_held(&ctx->uring_lock);
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req->rsrc_node = ctx->rsrc_node;
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if (!(issue_flags & IO_URING_F_UNLOCKED)) {
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lockdep_assert_held(&ctx->uring_lock);
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io_charge_rsrc_node(ctx);
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} else {
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percpu_ref_get(&req->rsrc_node->refs);
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}
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io_charge_rsrc_node(ctx);
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io_ring_submit_unlock(ctx, issue_flags);
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}
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}
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