CVE-2022-50261
Estado: AnalizadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
drm/sti: Fix return type of sti_{dvo,hda,hdmi}_connector_mode_valid()
With clang's kernel control flow integrity (kCFI, CONFIG_CFI_CLANG), indirect call targets are validated against the expected function pointer prototype to make sure the call target is valid to help mitigate ROP attacks. If they are not identical, there is a failure at run time, which manifests as either a kernel panic or thread getting killed. A proposed warning in clang aims to catch these at compile time, which reveals:
->mode_valid() in 'struct drm_connector_helper_funcs' expects a return type of 'enum drm_mode_status', not 'int'. Adjust the return type of sti_{dvo,hda,hdmi}_connector_mode_valid() to match the prototype's to resolve the warning and CFI failure.
Detalles técnicos trazas, registros y código del informe original
drivers/gpu/drm/sti/sti_hda.c:637:16: error: incompatible function pointer types initializing 'enum drm_mode_status (*)(struct drm_connector *, struct drm_display_mode *)' with an expression of type 'int (struct drm_connector *, struct drm_display_mode *)' [-Werror,-Wincompatible-function-pointer-types-strict]
.mode_valid = sti_hda_connector_mode_valid,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/sti/sti_dvo.c:376:16: error: incompatible function pointer types initializing 'enum drm_mode_status (*)(struct drm_connector *, struct drm_display_mode *)' with an expression of type 'int (struct drm_connector *, struct drm_display_mode *)' [-Werror,-Wincompatible-function-pointer-types-strict]
.mode_valid = sti_dvo_connector_mode_valid,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/sti/sti_hdmi.c:1035:16: error: incompatible function pointer types initializing 'enum drm_mode_status (*)(struct drm_connector *, struct drm_display_mode *)' with an expression of type 'int (struct drm_connector *, struct drm_display_mode *)' [-Werror,-Wincompatible-function-pointer-types-strict]
.mode_valid = sti_hdmi_connector_mode_valid,
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.16%
- Percentil entre todas las CVEs puntuadas: 5
- Fecha de la puntuación: 6/10/2026
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)
CWE
- NVD-CWE-noinfo
Referencias
- https://git.kernel.org/stable/c/04371a75a58422a301a9ff9ae3babd310ac3bb3f
- https://git.kernel.org/stable/c/0ad811cc08a937d875cbad0149c1bab17f84ba05
- https://git.kernel.org/stable/c/511b48ee8e4aec2d03d2af06b363d9eb3230b017
- https://git.kernel.org/stable/c/6e3c4d3fa5d458d685561ecbaf8daa9dba14979e
- https://git.kernel.org/stable/c/8f9941dea3a70b73f2063f9dcc4aaae6af03c5ba
- https://git.kernel.org/stable/c/a075c21ee026f4a74f9fce5928ea3c8d18a8af13
- https://git.kernel.org/stable/c/b2c92b2a3801b09b709cbefd9a9e4944b72400bf
- https://git.kernel.org/stable/c/b4307c7d35e346b909edfdc1f280902150570bb6
- https://git.kernel.org/stable/c/e578b0906b6a81479cd5b5b6c848a7096addf5e9
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/sti: Fix return type of sti_{dvo,hda,hdmi}_connector_mode_valid()\n\nWith clang's kernel control flow integrity (kCFI, CONFIG_CFI_CLANG),\nindirect call targets are validated against the expected function\npointer prototype to make sure the call target is valid to help mitigate\nROP attacks. If they are not identical, there is a failure at run time,\nwhich manifests as either a kernel panic or thread getting killed. A\nproposed warning in clang aims to catch these at compile time, which\nreveals:\n\n drivers/gpu/drm/sti/sti_hda.c:637:16: error: incompatible function pointer types initializing 'enum drm_mode_status (*)(struct drm_connector *, struct drm_display_mode *)' with an expression of type 'int (struct drm_connector *, struct drm_display_mode *)' [-Werror,-Wincompatible-function-pointer-types-strict]\n .mode_valid = sti_hda_connector_mode_valid,\n ^~~~~~~~~~~~~~~~~~~~~~~~~~~~\n drivers/gpu/drm/sti/sti_dvo.c:376:16: error: incompatible function pointer types initializing 'enum drm_mode_status (*)(struct drm_connector *, struct drm_display_mode *)' with an expression of type 'int (struct drm_connector *, struct drm_display_mode *)' [-Werror,-Wincompatible-function-pointer-types-strict]\n .mode_valid = sti_dvo_connector_mode_valid,\n ^~~~~~~~~~~~~~~~~~~~~~~~~~~~\n drivers/gpu/drm/sti/sti_hdmi.c:1035:16: error: incompatible function pointer types initializing 'enum drm_mode_status (*)(struct drm_connector *, struct drm_display_mode *)' with an expression of type 'int (struct drm_connector *, struct drm_display_mode *)' [-Werror,-Wincompatible-function-pointer-types-strict]\n .mode_valid = sti_hdmi_connector_mode_valid,\n ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n\n->mode_valid() in 'struct drm_connector_helper_funcs' expects a return\ntype of 'enum drm_mode_status', not 'int'. Adjust the return type of\nsti_{dvo,hda,hdmi}_connector_mode_valid() to match the prototype's to\nresolve the warning and CFI failure."
}
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