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CVE-2022-49232

Estado: ModificadaMedia (5.5)—

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

drm/amd/display: Fix a NULL pointer dereference in amdgpu_dm_connector_add_common_modes()

In amdgpu_dm_connector_add_common_modes(), amdgpu_dm_create_common_mode() is assigned to mode and is passed to drm_mode_probed_add() directly after that. drm_mode_probed_add() passes &mode->head to list_add_tail(), and there is a dereference of it in list_add_tail() without recoveries, which could lead to NULL pointer dereference on failure of amdgpu_dm_create_common_mode().

Fix this by adding a NULL check of mode.

This bug was found by a static analyzer.

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Builds with 'make allyesconfig' show no new warnings, and our static analyzer no longer warns about this code.

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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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: Fix a NULL pointer dereference in amdgpu_dm_connector_add_common_modes()\n\nIn amdgpu_dm_connector_add_common_modes(), amdgpu_dm_create_common_mode()\nis assigned to mode and is passed to drm_mode_probed_add() directly after\nthat. drm_mode_probed_add() passes &mode->head to list_add_tail(), and\nthere is a dereference of it in list_add_tail() without recoveries, which\ncould lead to NULL pointer dereference on failure of\namdgpu_dm_create_common_mode().\n\nFix this by adding a NULL check of mode.\n\nThis bug was found by a static analyzer.\n\nBuilds with 'make allyesconfig' show no new warnings,\nand our static analyzer no longer warns about this code."
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      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drm/amd/display: Corrige una desreferencia de puntero NULL en amdgpu_dm_connector_add_common_modes() En amdgpu_dm_connector_add_common_modes(), amdgpu_dm_create_common_mode() se asigna a mode y se pasa a drm_mode_probed_add() directamente después de eso. drm_mode_probed_add() pasa &mode->head a list_add_tail(), y hay una desreferencia de este en list_add_tail() sin recuperaciones, lo que podría provocar una desreferencia de puntero NULL en caso de fallo de amdgpu_dm_create_common_mode(). Corrige esto agregando una comprobación NULL de mode. Este error fue encontrado por un analizador estático. Las compilaciones con 'make allyesconfig' no muestran nuevas advertencias y nuestro analizador estático ya no advierte sobre este código."
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