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io_uring/rsrc: fix rogue rsrc node grabbing
author
Pavel Begunkov
<asml.silence@gmail.com>
Wed, 29 Mar 2023 14:03:43 +0000
(15:03 +0100)
committer
Jens Axboe
<axboe@kernel.dk>
Wed, 29 Mar 2023 15:23:46 +0000
(09:23 -0600)
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:
5106dd6e74ab6
("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>
io_uring/rsrc.h
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diff --git
a/io_uring/rsrc.h
b/io_uring/rsrc.h
index 2b8743645efcbd5d29709fbd2ecff2b6d51e86f3..f27f4975217d94ada42a3474fe5da0b04285eb3c 100644
(file)
--- a/
io_uring/rsrc.h
+++ b/
io_uring/rsrc.h
@@
-144,15
+144,13
@@
static inline void io_req_set_rsrc_node(struct io_kiocb *req,
unsigned int issue_flags)
{
if (!req->rsrc_node) {
-
req->rsrc_node = ctx->rsrc_node
;
+
io_ring_submit_lock(ctx, issue_flags)
;
- if (!(issue_flags & IO_URING_F_UNLOCKED)) {
- lockdep_assert_held(&ctx->uring_lock);
+ lockdep_assert_held(&ctx->uring_lock);
- io_charge_rsrc_node(ctx);
- } else {
- percpu_ref_get(&req->rsrc_node->refs);
- }
+ req->rsrc_node = ctx->rsrc_node;
+ io_charge_rsrc_node(ctx);
+ io_ring_submit_unlock(ctx, issue_flags);
}
}