linux-kernel - [PATCH 2/2] virtio_ring: fix error - 'prev' and 'head_flags' may be used uninitialized in this function

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Date:   Wed, 14 Jul 2021 10:28:54 +0800
From:   Cai Huoqing <caihuoqing@...du.com>
To:     <sgarzare@...hat.com>, <mst@...hat.com>, <jasowang@...hat.com>
CC:     <virtualization@...ts.linux-foundation.org>,
        <linux-kernel@...r.kernel.org>, Cai Huoqing <caihuoqing@...du.com>
Subject: [PATCH 2/2] virtio_ring: fix error - 'prev' and 'head_flags' may be used uninitialized in this function

when run "make virtio" in linux/tools,
the error: "'prev' and 'head_flags' may be used
uninitialized in this function" occurs

Signed-off-by: Cai Huoqing <caihuoqing@...du.com>
---
 drivers/virtio/virtio_ring.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 89bfe46a8a7f..290bdf8a3d36 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -486,7 +486,7 @@ static inline int virtqueue_add_split(struct virtqueue *_vq,
        struct vring_virtqueue *vq = to_vvq(_vq);
        struct scatterlist *sg;
        struct vring_desc *desc;
-       unsigned int i, n, avail, descs_used, prev, err_idx;
+       unsigned int i, n, avail, descs_used, prev = 0, err_idx;
        int head;
        bool indirect;

@@ -1173,8 +1173,8 @@ static inline int virtqueue_add_packed(struct virtqueue *_vq,
        struct vring_packed_desc *desc;
        struct scatterlist *sg;
        unsigned int i, n, c, descs_used, err_idx;
-       __le16 head_flags, flags;
-       u16 head, id, prev, curr, avail_used_flags;
+       __le16 head_flags = 0, flags;
+       u16 head, id, prev = 0, curr, avail_used_flags;

        START_USE(vq);

--
2.25.1