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| author | Dan Carpenter <dan.carpenter@oracle.com> | 2021-12-08 13:33:37 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-12-22 11:32:36 +0300 |
| commit | b08b3bfcc720686cd73888ab20111acd9cbfcb19 (patch) | |
| tree | ae77d937704999dc7e93c25e5f38a83836595eb7 /drivers/vhost | |
| parent | 0c51663c77d21f78866cb36abccb59419c32e102 (diff) | |
| download | linux-b08b3bfcc720686cd73888ab20111acd9cbfcb19.tar.xz | |
vdpa: check that offsets are within bounds
commit 3ed21c1451a14d139e1ceb18f2fa70865ce3195a upstream.
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
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/vhost')
| -rw-r--r-- | drivers/vhost/vdpa.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index 39039e046117..d62f05d056b7 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) |