linux-kernel - Re: [syzbot] [io-uring?] KMSAN: uninit-value in io_req_task_work_add

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Message-ID: <tencent_BDF63D63379896FC36DA4B94758377296609@qq.com>
Date: Wed, 24 Jul 2024 20:11:23 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+82609b8937a4458106ca@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [io-uring?] KMSAN: uninit-value in io_req_task_work_add_remote

when alloc buffer for req, init mem to 0

#syz test: upstream 2c9b3512402e

diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 8e6faa942a6f..acd2c5aac1ad 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -2177,6 +2177,7 @@ static inline int io_submit_sqe(struct io_ring_ctx *ctx, struct io_kiocb *req,
 		return 0;
 	}
 
+	atomic_set(&ctx->cq_wait_nr, IO_CQ_WAKE_INIT);
 	io_queue_sqe(req);
 	return 0;
 }