diff options
| author | Colin Ian King <colin.king@canonical.com> | 2021-09-30 11:19:41 +0100 |
|---|---|---|
| committer | Gerd Hoffmann <kraxel@redhat.com> | 2021-10-29 08:26:23 +0200 |
| commit | 8f4502fa284478a5264afa8a5a95511276fa9b80 (patch) | |
| tree | dafb4a4369893aa19bcfe927529111cc8736fb57 /drivers/gpu/drm/virtio/virtgpu_ioctl.c | |
| parent | 7cf09865885793f57003492f1cd3b76cf4cf0eb1 (diff) | |
drm/virtio: fix potential integer overflow on shift of a int
The left shift of unsigned int 32 bit integer constant 1 is evaluated
using 32 bit arithmetic and then assigned to a signed 64 bit integer.
In the case where i is 32 or more this can lead to an overflow. Fix
this by shifting the value 1ULL instead.
Addresses-Coverity: ("Uninitentional integer overflow")
Fixes: 8d6b006e1f51 ("drm/virtio: implement context init: handle VIRTGPU_CONTEXT_PARAM_POLL_RINGS_MASK")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20210930101941.16546-1-colin.king@canonical.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/virtio/virtgpu_ioctl.c')
| -rw-r--r-- | drivers/gpu/drm/virtio/virtgpu_ioctl.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c index 5618a1d5879c..b3b0557d72cf 100644 --- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c +++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c @@ -819,7 +819,7 @@ static int virtio_gpu_context_init_ioctl(struct drm_device *dev, if (vfpriv->ring_idx_mask) { valid_ring_mask = 0; for (i = 0; i < vfpriv->num_rings; i++) - valid_ring_mask |= 1 << i; + valid_ring_mask |= 1ULL << i; if (~valid_ring_mask & vfpriv->ring_idx_mask) { ret = -EINVAL; |