cve-2021-47108
Vulnerability from cvelistv5
Published
2024-03-04 18:15
Modified
2024-08-04 05:24
Severity
Summary
drm/mediatek: hdmi: Perform NULL pointer check for mtk_hdmi_conf
References
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/mediatek: hdmi: Perform NULL pointer check for mtk_hdmi_conf\n\nIn commit 41ca9caaae0b\n(\"drm/mediatek: hdmi: Add check for CEA modes only\") a check\nfor CEA modes was added to function mtk_hdmi_bridge_mode_valid()\nin order to address possible issues on MT8167;\nmoreover, with commit c91026a938c2\n(\"drm/mediatek: hdmi: Add optional limit on maximal HDMI mode clock\")\nanother similar check was introduced.\n\nUnfortunately though, at the time of writing, MT8173 does not provide\nany mtk_hdmi_conf structure and this is crashing the kernel with NULL\npointer upon entering mtk_hdmi_bridge_mode_valid(), which happens as\nsoon as a HDMI cable gets plugged in.\n\nTo fix this regression, add a NULL pointer check for hdmi-\u003econf in the\nsaid function, restoring HDMI functionality and avoiding NULL pointer\nkernel panics."
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"title": "drm/mediatek: hdmi: Perform NULL pointer check for mtk_hdmi_conf",
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"nvd": "{\"cve\":{\"id\":\"CVE-2021-47108\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-03-04T19:15:18.837\",\"lastModified\":\"2024-03-05T13:41:01.900\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ndrm/mediatek: hdmi: Perform NULL pointer check for mtk_hdmi_conf\\n\\nIn commit 41ca9caaae0b\\n(\\\"drm/mediatek: hdmi: Add check for CEA modes only\\\") a check\\nfor CEA modes was added to function mtk_hdmi_bridge_mode_valid()\\nin order to address possible issues on MT8167;\\nmoreover, with commit c91026a938c2\\n(\\\"drm/mediatek: hdmi: Add optional limit on maximal HDMI mode clock\\\")\\nanother similar check was introduced.\\n\\nUnfortunately though, at the time of writing, MT8173 does not provide\\nany mtk_hdmi_conf structure and this is crashing the kernel with NULL\\npointer upon entering mtk_hdmi_bridge_mode_valid(), which happens as\\nsoon as a HDMI cable gets plugged in.\\n\\nTo fix this regression, add a NULL pointer check for hdmi-\u003econf in the\\nsaid function, restoring HDMI functionality and avoiding NULL pointer\\nkernel panics.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: drm/mediatek: hdmi: realice una verificaci\u00f3n de puntero NULL para mtk_hdmi_conf En el commit 41ca9caaae0b (\\\"drm/mediatek: hdmi: agregue verificaci\u00f3n solo para modos CEA\\\") se agreg\u00f3 una verificaci\u00f3n para los modos CEA funcionar mtk_hdmi_bridge_mode_valid() para solucionar posibles problemas en MT8167; Adem\u00e1s, con el commit c91026a938c2 (\\\"drm/mediatek: hdmi: Agregar l\u00edmite opcional en el reloj m\u00e1ximo en modo HDMI\\\") se introdujo otra verificaci\u00f3n similar. Desafortunadamente, al momento de escribir este art\u00edculo, MT8173 no proporciona ninguna estructura mtk_hdmi_conf y esto bloquea el kernel con un puntero NULL al ingresar a mtk_hdmi_bridge_mode_valid(), lo que sucede tan pronto como se conecta un cable HDMI. Para solucionar esta regresi\u00f3n, agregue un El puntero NULL comprueba hdmi-\u0026gt;conf en dicha funci\u00f3n, restaurando la funcionalidad HDMI y evitando p\u00e1nicos del kernel del puntero NULL.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3b8e19a0aa3933a785be9f1541afd8d398c4ec69\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/71d07ebc5000b9c1d140e99e7493b0bafa954776\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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