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authorDan Carpenter <dan.carpenter@oracle.com>2021-12-08 13:33:37 +0300
committerMichael S. Tsirkin <mst@redhat.com>2021-12-08 14:53:15 -0500
commit3ed21c1451a14d139e1ceb18f2fa70865ce3195a (patch)
treeeeb29cc356febfbbd40ed9cd4f888eb5d6181b06 /drivers/vhost
parentff9f9c6e74848170fcb45c8403c80d661484c8c9 (diff)
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vdpa: check that offsets are within bounds
In this function "c->off" is a u32 and "size" is a long. On 64bit systems if "c->off" is greater than "size" then "size - c->off" is a negative and we always return -E2BIG. But on 32bit systems the subtraction is type promoted to a high positive u32 value and basically any "c->len" is accepted. Fixes: 4c8cf31885f6 ("vhost: introduce vDPA-based backend") Reported-by: Xie Yongji <xieyongji@bytedance.com> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Link: https://lore.kernel.org/r/20211208103337.GA4047@kili Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers/vhost')
-rw-r--r--drivers/vhost/vdpa.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 29cced1cd277..e3c4f059b21a 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -197,7 +197,7 @@ static int vhost_vdpa_config_validate(struct vhost_vdpa *v,
struct vdpa_device *vdpa = v->vdpa;
long size = vdpa->config->get_config_size(vdpa);
- if (c->len == 0)
+ if (c->len == 0 || c->off > size)
return -EINVAL;
if (c->len > size - c->off)