linux-kernel - Re: [syzbot] [virtualization?] KMSAN: uninit-value in virtqueue

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Message-ID: <tencent_613652973C377A4AEC7507777B66C63C8309@qq.com>
Date: Fri, 26 Jan 2024 09:35:21 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+d7521c1e3841ed075a42@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [virtualization?] KMSAN: uninit-value in virtqueue_add (4)

please test uninit-value in virtqueue_add (4)

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git fbafc3e621c3

diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c
index 9d1bdcdc1331..4ca6627a7459 100644
--- a/drivers/scsi/virtio_scsi.c
+++ b/drivers/scsi/virtio_scsi.c
@@ -427,7 +427,7 @@ static int __virtscsi_add_cmd(struct virtqueue *vq,
 			    size_t req_size, size_t resp_size)
 {
 	struct scsi_cmnd *sc = cmd->sc;
-	struct scatterlist *sgs[6], req, resp;
+	struct scatterlist *sgs[6], req = {}, resp = {};
 	struct sg_table *out, *in;
 	unsigned out_num = 0, in_num = 0;