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Change History

In the Linux kernel, the following vulnerability has been resolved:

drm/vmwgfx: Fix a null-ptr access in the cursor snooper

Check that the resource which is converted to a surface exists before
trying to use the cursor snooper on it.

vmw_cmd_res_check allows explicit invalid (SVGA3D_INVALID_ID) identifiers
because some svga commands accept SVGA3D_INVALID_ID to mean "no surface",
unfortunately functions that accept the actual surfaces as objects might
(and in case of the cursor snooper, do not) be able to handle null
objects. Make sure that we validate not only the identifier (via the
vmw_cmd_res_check) but also check that the actual resource exists before
trying to do something with it.

Fixes unchecked null-ptr reference in the snooping code.

https://git.kernel.org/stable/c/13c9e4ed125e19484234c960efe5ac9c55119523

https://git.kernel.org/stable/c/299cfb5a7deabdf9ecd30071755672af0aced5eb

https://git.kernel.org/stable/c/5ac2c0279053a2c5265d46903432fb26ae2d0da2

https://git.kernel.org/stable/c/b6fca0a07989f361ceda27cb2d09c555d4d4a964