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| author | Colin Ian King <colin.king@canonical.com> | 2021-09-30 11:27:48 +0100 |
|---|---|---|
| committer | Gerd Hoffmann <kraxel@redhat.com> | 2021-10-29 08:26:23 +0200 |
| commit | 74c1bda2f3fa79a93e1c910008649b49b02dc09d (patch) | |
| tree | 15cc6ca9d9da1d80945e6c568afddd843a0efa06 | |
| parent | 8f4502fa284478a5264afa8a5a95511276fa9b80 (diff) | |
| download | linux-stable-74c1bda2f3fa79a93e1c910008649b49b02dc09d.tar.gz linux-stable-74c1bda2f3fa79a93e1c910008649b49b02dc09d.tar.bz2 linux-stable-74c1bda2f3fa79a93e1c910008649b49b02dc09d.zip | |
drm/virtio: fix another 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 value is 32 or more this can lead to an overflow
(value can be in range 0..MAX_CAPSET_ID (63). Fix this by shifting
the value 1ULL instead.
Addresses-Coverity: ("Uninitentional integer overflow")
Fixes: 4fb530e5caf7 ("drm/virtio: implement context init: support init ioctl")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20210930102748.16922-1-colin.king@canonical.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
| -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 b3b0557d72cf..0007e423d885 100644 --- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c +++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c @@ -774,7 +774,7 @@ static int virtio_gpu_context_init_ioctl(struct drm_device *dev, goto out_unlock; } - if ((vgdev->capset_id_mask & (1 << value)) == 0) { + if ((vgdev->capset_id_mask & (1ULL << value)) == 0) { ret = -EINVAL; goto out_unlock; } |