CVE-2023-53784 (GCVE-0-2023-53784)

Vulnerability from cvelistv5 – Published: 2025-12-09 00:00 – Updated: 2025-12-09 00:00
VLAI?
Title
drm: bridge: dw_hdmi: fix connector access for scdc
Summary
In the Linux kernel, the following vulnerability has been resolved: drm: bridge: dw_hdmi: fix connector access for scdc Commit 5d844091f237 ("drm/scdc-helper: Pimp SCDC debugs") changed the scdc interface to pick up an i2c adapter from a connector instead. However, in the case of dw-hdmi, the wrong connector was being used to pass i2c adapter information, since dw-hdmi's embedded connector structure is only populated when the bridge attachment callback explicitly asks for it. drm-meson is handling connector creation, so this won't happen, leading to a NULL pointer dereference. Fix it by having scdc functions access dw-hdmi's current connector pointer instead, which is assigned during the bridge enablement stage. [narmstrong: moved Fixes tag before first S-o-b and added Reported-by tag]
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 5d844091f2370f01752c3129b147861b9dcd3d98 , < 552f79aa9e801ed4f74d6b3221af78042ba4f235 (git)
Affected: 5d844091f2370f01752c3129b147861b9dcd3d98 , < 98703e4e061fb8715c7613cd227e32cdfd136b23 (git)
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    Linux Linux Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 6.4.5 , ≤ 6.4.* (semver)
Unaffected: 6.5 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm: bridge: dw_hdmi: fix connector access for scdc\n\nCommit 5d844091f237 (\"drm/scdc-helper: Pimp SCDC debugs\") changed the scdc\ninterface to pick up an i2c adapter from a connector instead. However, in\nthe case of dw-hdmi, the wrong connector was being used to pass i2c adapter\ninformation, since dw-hdmi\u0027s embedded connector structure is only populated\nwhen the bridge attachment callback explicitly asks for it.\n\ndrm-meson is handling connector creation, so this won\u0027t happen, leading to\na NULL pointer dereference.\n\nFix it by having scdc functions access dw-hdmi\u0027s current connector pointer\ninstead, which is assigned during the bridge enablement stage.\n\n[narmstrong: moved Fixes tag before first S-o-b and added Reported-by tag]"
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          "url": "https://git.kernel.org/stable/c/98703e4e061fb8715c7613cd227e32cdfd136b23"
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