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io_uring/rsrc: fix rogue rsrc node grabbing 

commit 4ff0b50de8 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pavel Begunkov 2023-03-29 15:03:43 +01:00 committed by Greg Kroah-Hartman
parent 6ec9b2d103
commit 0651b59810
1 changed files with 6 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
io_uring/rsrc.h
View File

@ -144,15 +144,13 @@ static inline void io_req_set_rsrc_node(struct io_kiocb *req,
unsigned int issue_flags)
{
if (!req->rsrc_node) {
io_ring_submit_lock(ctx, issue_flags);
lockdep_assert_held(&ctx->uring_lock);
req->rsrc_node = ctx->rsrc_node;
if (!(issue_flags & IO_URING_F_UNLOCKED)) {
lockdep_assert_held(&ctx->uring_lock);
io_charge_rsrc_node(ctx);
} else {
percpu_ref_get(&req->rsrc_node->refs);
}
io_charge_rsrc_node(ctx);
io_ring_submit_unlock(ctx, issue_flags);
}
}