| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.11 066/601] drm/radeon: fix copy of uninitialized variable back to userspace | Date | Wed, 12 May 2021 16:42:23 +0200 |
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From: Colin Ian King <colin.king@canonical.com>
commit 8dbc2ccac5a65c5b57e3070e36a3dc97c7970d96 upstream.
Currently the ioctl command RADEON_INFO_SI_BACKEND_ENABLED_MASK can copy back uninitialised data in value_tmp that pointer *value points to. This can occur when rdev->family is less than CHIP_BONAIRE and less than CHIP_TAHITI. Fix this by adding in a missing -EINVAL so that no invalid value is copied back to userspace.
Addresses-Coverity: ("Uninitialized scalar variable) Cc: stable@vger.kernel.org # 3.13+ Fixes: 439a1cfffe2c ("drm/radeon: expose render backend mask to the userspace") Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/gpu/drm/radeon/radeon_kms.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/gpu/drm/radeon/radeon_kms.c +++ b/drivers/gpu/drm/radeon/radeon_kms.c @@ -514,6 +514,7 @@ int radeon_info_ioctl(struct drm_device *value = rdev->config.si.backend_enable_mask; } else { DRM_DEBUG_KMS("BACKEND_ENABLED_MASK is si+ only!\n"); + return -EINVAL; } break; case RADEON_INFO_MAX_SCLK:
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