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

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Date: Sat, 16 Mar 2024 11:48:11 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+f8e9a371388aa62ecab4@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [io-uring?] KMSAN: uninit-value in io_sendrecv_fail

please test uv in io_sendrecv_fail

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index cd9a137ad6ce..3db59fd6f676 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -1066,6 +1066,7 @@ static void io_preinit_req(struct io_kiocb *req, struct io_ring_ctx *ctx)
 	/* not necessary, but safer to zero */
 	memset(&req->cqe, 0, sizeof(req->cqe));
 	memset(&req->big_cqe, 0, sizeof(req->big_cqe));
+	memset(&req->cmd, 0, sizeof(req->cmd));
 }
 
 static void io_flush_cached_locked_reqs(struct io_ring_ctx *ctx,