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List:       linux-hardening
Subject:    [PATCH 5/5] drm: vmgfx_surface.c: copy user-array safely
From:       Philipp Stanner <pstanner () redhat ! com>
Date:       2023-08-30 13:45:56
Message-ID: 6f9397d6af919b7e8325c2945385c13aaa3dc5f1.1693386602.git.pstanner () redhat ! com
[Download RAW message or body]

Currently, there is no overflow-check with memdup_user().

Use the new function memdup_array_user() instead of memdup_user() for
duplicating the user-space array safely.

Suggested-by: David Airlie <airlied@redhat.com>
Signed-off-by: Philipp Stanner <pstanner@redhat.com>
---
 drivers/gpu/drm/vmwgfx/vmwgfx_surface.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
index 5db403ee8261..9be185b094cb 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
@@ -777,9 +777,9 @@ int vmw_surface_define_ioctl(struct drm_device *dev, void *data,
 	       sizeof(metadata->mip_levels));
 	metadata->num_sizes = num_sizes;
 	metadata->sizes =
-		memdup_user((struct drm_vmw_size __user *)(unsigned long)
+		memdup_array_user((struct drm_vmw_size __user *)(unsigned long)
 			    req->size_addr,
-			    sizeof(*metadata->sizes) * metadata->num_sizes);
+			    metadata->num_sizes, sizeof(*metadata->sizes));
 	if (IS_ERR(metadata->sizes)) {
 		ret = PTR_ERR(metadata->sizes);
 		goto out_no_sizes;
-- 
2.41.0

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