CVE-2023-53991

published 2025-12-24

CVE-2023-53991: 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…

Priority P4 20

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

15 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.1.20-1 (bookworm)	linux 6.1.20-1 (bookworm)
linux	linux	—	—
linux	linux	>= bb00a452d6f77391441ef7df48f7115dd459cd2f < 8dbd54d679e3ab37be43bc1ed9f463dbf83a2259	8dbd54d679e3ab37be43bc1ed9f463dbf83a2259
linux	linux	>= bb00a452d6f77391441ef7df48f7115dd459cd2f < bf661c5e3bc48973acb363c76e3db965d9ed26d0	bf661c5e3bc48973acb363c76e3db965d9ed26d0
linux	linux	>= bb00a452d6f77391441ef7df48f7115dd459cd2f < 9e1e236acdc42b5c43ec8d7f03a39537e70cc309	9e1e236acdc42b5c43ec8d7f03a39537e70cc309
linux	linux	>= bb00a452d6f77391441ef7df48f7115dd459cd2f < 9fe3644c720ac87d150f0bba5a4ae86cae55afaf	9fe3644c720ac87d150f0bba5a4ae86cae55afaf
linux	linux	>= bb00a452d6f77391441ef7df48f7115dd459cd2f < abc40122d9a69f56c04efb5a7485795f5ac799d1	abc40122d9a69f56c04efb5a7485795f5ac799d1
linux	linux_kernel	>= 0 < 5.10.178-1	5.10.178-1
linux	linux_kernel	>= 0 < 6.1.20-1	6.1.20-1
linux	linux_kernel	>= 0 < 6.1.20-1	6.1.20-1
linux	linux_kernel	>= 0 < 6.1.20-1	6.1.20-1
linux	linux_kernel	>= 5.11.0 < 5.15.99	5.15.99
linux	linux_kernel	>= 5.16.0 < 6.1.16	6.1.16
linux	linux_kernel	>= 5.7.0 < 5.10.173	5.10.173
linux	linux_kernel	>= 6.2.0 < 6.2.3	6.2.3

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