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authorDan Carpenter <dan.carpenter@oracle.com>2020-04-06 17:45:52 +0300
committerMichael S. Tsirkin <mst@redhat.com>2020-08-10 10:38:55 -0400
commitcf16fe9243bfa2863491026fc727618c7c593c84 (patch)
tree307e7504e850eb89fca913611f87b5d3fd81a125 /drivers/vdpa
parent2874211fcdb751e2962d68cdb9783fa1ff8eb340 (diff)
vdpa: Fix pointer math bug in vdpasim_get_config()
If "offset" is non-zero then we end up copying from beyond the end of the config because of pointer math. We can fix this by casting the struct to a u8 pointer. Fixes: 2c53d0f64c06 ("vdpasim: vDPA device simulator") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Link: https://lore.kernel.org/r/20200406144552.GF68494@mwanda Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Jason Wang <jasowang@redhat.com>
Diffstat (limited to 'drivers/vdpa')
-rw-r--r--drivers/vdpa/vdpa_sim/vdpa_sim.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
index 604d9d25ca47..62d640327145 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
@@ -558,7 +558,7 @@ static void vdpasim_get_config(struct vdpa_device *vdpa, unsigned int offset,
struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
if (offset + len < sizeof(struct virtio_net_config))
- memcpy(buf, &vdpasim->config + offset, len);
+ memcpy(buf, (u8 *)&vdpasim->config + offset, len);
}
static void vdpasim_set_config(struct vdpa_device *vdpa, unsigned int offset,