Description
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.
Product status
c0951b797e7d0f2c6b0df2c0e18185c72d0cf1a1 (git) before 299cfb5a7deabdf9ecd30071755672af0aced5eb
c0951b797e7d0f2c6b0df2c0e18185c72d0cf1a1 (git) before 13c9e4ed125e19484234c960efe5ac9c55119523
c0951b797e7d0f2c6b0df2c0e18185c72d0cf1a1 (git) before b6fca0a07989f361ceda27cb2d09c555d4d4a964
c0951b797e7d0f2c6b0df2c0e18185c72d0cf1a1 (git) before 5ac2c0279053a2c5265d46903432fb26ae2d0da2
3.8
Any version before 3.8
6.6.113 (semver)
6.12.54 (semver)
6.17.4 (semver)
6.18 (original_commit_for_fix)
References
git.kernel.org/...c/299cfb5a7deabdf9ecd30071755672af0aced5eb
git.kernel.org/...c/13c9e4ed125e19484234c960efe5ac9c55119523
git.kernel.org/...c/b6fca0a07989f361ceda27cb2d09c555d4d4a964
git.kernel.org/...c/5ac2c0279053a2c5265d46903432fb26ae2d0da2
