From 9b50c185d27d232fa68e3382398bfae7d4d23f8f Mon Sep 17 00:00:00 2001 From: Colin Ian King Date: Wed, 3 Mar 2021 00:27:59 +0000 Subject: [PATCH] drm/radeon: fix copy of uninitialized variable back to userspace MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Signed-off-by: Colin Ian King Signed-off-by: Alex Deucher Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/radeon/radeon_kms.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/gpu/drm/radeon/radeon_kms.c b/drivers/gpu/drm/radeon/radeon_kms.c index 99ee60f..8c0a572 100644 --- a/drivers/gpu/drm/radeon/radeon_kms.c +++ b/drivers/gpu/drm/radeon/radeon_kms.c @@ -512,6 +512,7 @@ static int radeon_info_ioctl(struct drm_device *dev, void *data, struct drm_file *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: -- 2.7.4