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authorPavel Begunkov <asml.silence@gmail.com>2023-03-29 17:03:43 +0300
committerJens Axboe <axboe@kernel.dk>2023-03-29 18:23:46 +0300
commit4ff0b50de8cabba055efe50bbcb7506c41a69835 (patch)
treed29a66b03328ba5b6707ea46e762de75c30979fc /io_uring
parent005308f7bdacf5685ed1a431244a183dbbb9e0e8 (diff)
downloadlinux-4ff0b50de8cabba055efe50bbcb7506c41a69835.tar.xz
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: 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>
Diffstat (limited to 'io_uring')
-rw-r--r--io_uring/rsrc.h12
1 files changed, 5 insertions, 7 deletions
diff --git a/io_uring/rsrc.h b/io_uring/rsrc.h
index 2b8743645efc..f27f4975217d 100644
--- 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);
}
}