Messages in this thread Patch in this message | | | Date | Mon, 10 Aug 2020 08:58:35 -0400 | From | "Michael S. Tsirkin" <> | Subject | [PATCH] vdpa_sim: fix pointer math in get_config |
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There is a pointer math bug here: the variable cast is a struct so the offset is in units of struct size. If "offset" is non-zero this will copy memory from beyond the end of the array.
fixes: 2c53d0f64c06 ("vdpasim: vDPA device simulator") Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> --- drivers/vdpa/vdpa_sim/vdpa_sim.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
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, -- MST
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