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Date: Wed, 12 May 2021 16:42:54 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org,
Christian König <christian.koenig@....com>,
Colin Ian King <colin.king@...onical.com>,
Alex Deucher <alexander.deucher@....com>
Subject: [PATCH 5.10 064/530] drm/radeon: fix copy of uninitialized variable back to userspace
From: Colin Ian King <colin.king@...onical.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@...r.kernel.org # 3.13+
Fixes: 439a1cfffe2c ("drm/radeon: expose render backend mask to the userspace")
Reviewed-by: Christian König <christian.koenig@....com>
Signed-off-by: Colin Ian King <colin.king@...onical.com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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
@@ -512,6 +512,7 @@ static int radeon_info_ioctl(struct drm_
*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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