Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: drm/msm/dpu: Disallow unallocated resources to be returned In the event that the topology requests resources that have not been created by the system (because they are typically not represented in dpu_mdss_cfg ^1), the resource(s) in global_state (in this case DSC blocks, until their allocation/assignment is being sanity-checked in "drm/msm/dpu: Reject topologies for which no DSC blocks are available") remain NULL but will still be returned out of dpu_rm_get_assigned_resources, where the caller expects to get an array containing num_blks valid pointers (but instead gets these NULLs). To prevent this from happening, where null-pointer dereferences typically result in a hard-to-debug platform lockup, num_blks shouldn't increase past NULL blocks and will print an error and break instead. After all, max_blks represents the static size of the maximum number of blocks whereas the actual amount varies per platform. ^1: which can happen after a git rebase ended up moving additions to _dpu_cfg to a different struct which has the same patch context. Patchwork: https://patchwork.freedesktop.org/patch/517636/
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected bb00a452d6f77391441ef7df48f7115dd459cd2f before 8dbd54d679e3ab37be43bc1ed9f463dbf83a2259; affected bb00a452d6f77391441ef7df48f7115dd459cd2f before bf661c5e3bc48973acb363c76e3db965d9ed26d0; affected bb00a452d6f77391441ef7df48f7115dd459cd2f before 9e1e236acdc42b5c43ec8d7f03a39537e70cc309; affected bb00a452d6f77391441ef7df48f7115dd459cd2f before 9fe3644c720ac87d150f0bba5a4ae86cae55afaf; affected bb00a452d6f77391441ef7df48f7115dd459cd2f before abc40122d9a69f56c04efb5a7485795f5ac799d1 |
| Linux / Linux | affected 5.7; unaffected 0 before 5.7; unaffected 5.10.173 through 5.10.*; unaffected 5.15.99 through 5.15.*; unaffected 6.1.16 through 6.1.*; unaffected 6.2.3 through 6.2.*; unaffected 6.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/8dbd54d679e3ab37be43bc1ed9f463dbf83a2259
- https://git.kernel.org/stable/c/bf661c5e3bc48973acb363c76e3db965d9ed26d0
- https://git.kernel.org/stable/c/9e1e236acdc42b5c43ec8d7f03a39537e70cc309
- https://git.kernel.org/stable/c/9fe3644c720ac87d150f0bba5a4ae86cae55afaf
- https://git.kernel.org/stable/c/abc40122d9a69f56c04efb5a7485795f5ac799d1