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CVE-2022-49221

Estado: ModificadaMedia (5.5)—

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

drm/msm/dp: populate connector of struct dp_panel

DP CTS test case 4.2.2.6 has valid edid with bad checksum on purpose and expect DP source return correct checksum. During drm edid read, correct edid checksum is calculated and stored at connector::real_edid_checksum.

The problem is struct dp_panel::connector never be assigned, instead the connector is stored in struct msm_dp::connector. When we run compliance testing test case 4.2.2.6 dp_panel_handle_sink_request() won't have a valid edid set in struct dp_panel::edid so we'll try to use the connectors real_edid_checksum and hit a NULL pointer dereference error because the connector pointer is never assigned.

Leer descripción completaMostrar menos

Changes in V2: -- populate panel connector at msm_dp_modeset_init() instead of at dp_panel_read_sink_caps()

Changes in V3: -- remove unhelpful kernel crash trace commit text -- remove renaming dp_display parameter to dp

Changes in V4: -- add more details to commit text

Changes in v10: -- group into one series

Changes in v11: -- drop drm/msm/dp: dp_link_parse_sink_count() return immediately if aux read

Signee-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/msm/dp: populate connector of struct dp_panel\n\nDP CTS test case 4.2.2.6 has valid edid with bad checksum on purpose\nand expect DP source return correct checksum. During drm edid read,\ncorrect edid checksum is calculated and stored at\nconnector::real_edid_checksum.\n\nThe problem is struct dp_panel::connector never be assigned, instead the\nconnector is stored in struct msm_dp::connector. When we run compliance\ntesting test case 4.2.2.6 dp_panel_handle_sink_request() won't have a valid\nedid set in struct dp_panel::edid so we'll try to use the connectors\nreal_edid_checksum and hit a NULL pointer dereference error because the\nconnector pointer is never assigned.\n\nChanges in V2:\n-- populate panel connector at msm_dp_modeset_init() instead of at dp_panel_read_sink_caps()\n\nChanges in V3:\n-- remove unhelpful kernel crash trace commit text\n-- remove renaming dp_display parameter to dp\n\nChanges in V4:\n-- add more details to commit text\n\nChanges in v10:\n--  group into one series\n\nChanges in v11:\n-- drop drm/msm/dp: dp_link_parse_sink_count() return immediately if aux read\n\nSignee-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drm/msm/dp: rellenar el conector de struct dp_panel DP CTS caso de prueba 4.2.2.6 tiene un edid válido con suma de comprobación incorrecta a propósito y espera que la fuente DP devuelva la suma de comprobación correcta. Durante la lectura del edid de drm, se calcula la suma de comprobación del edid correcta y se almacena en connector::real_edid_checksum. El problema es que struct dp_panel::connector nunca se asigna, en su lugar el conector se almacena en struct msm_dp::connector. Cuando ejecutamos el caso de prueba de prueba de cumplimiento 4.2.2.6 dp_panel_handle_sink_request() no tendrá un edid válido establecido en struct dp_panel::edid, por lo que intentaremos usar el conector real_edid_checksum y nos encontraremos con un error de desreferencia de puntero NULL porque el puntero del conector nunca se asigna. Cambios en V2: -- rellenar el conector del panel en msm_dp_modeset_init() en lugar de en dp_panel_read_sink_caps() Cambios en V3: -- eliminar el texto de confirmación de seguimiento de fallos del núcleo que no es de ayuda -- eliminar el cambio de nombre del parámetro dp_display a dp Cambios en V4: -- añadir más detalles al texto de confirmación Cambios en v10: -- agrupar en una serie Cambios en v11: -- eliminar drm/msm/dp: dp_link_parse_sink_count() retorna inmediatamente si se lee aux. Firmado por: Kuogee Hsieh "
    }
  ],
  "lastModified": "2026-06-17T05:17:25.630",
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