fkie_cve-2021-47650
Vulnerability from fkie_nvd
Published
2025-02-26 06:37
Modified
2025-09-23 18:47
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ASoC: soc-compress: prevent the potentially use of null pointer There is one call trace that snd_soc_register_card() ->snd_soc_bind_card()->soc_init_pcm_runtime() ->snd_soc_dai_compress_new()->snd_soc_new_compress(). In the trace the 'codec_dai' transfers from card->dai_link, and we can see from the snd_soc_add_pcm_runtime() in snd_soc_bind_card() that, if value of card->dai_link->num_codecs is 0, then 'codec_dai' could be null pointer caused by index out of bound in 'asoc_rtd_to_codec(rtd, 0)'. And snd_soc_register_card() is called by various platforms. Therefore, it is better to add the check in the case of misusing. And because 'cpu_dai' has already checked in soc_init_pcm_runtime(), there is no need to check again. Adding the check as follow, then if 'codec_dai' is null, snd_soc_new_compress() will not pass through the check 'if (playback + capture != 1)', avoiding the leftover use of 'codec_dai'.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/08af6da684b44097ea09f1d74d5858b837ed203bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4639c1d97f385f4784f44d66a3da0672f4951adaPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/68a69ad8df959e5211ed4a8e120783b2d352ea74Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/de2c6f98817fa5decb9b7d3b3a8a3ab864c10588Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f69a75cb8a98c6c487d620442c68595726a69f60Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fc237b8d624f4bcb0f21a532627ce4e3b3a85569Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *


To clipboard 

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  "descriptions": [
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nASoC: soc-compress: prevent the potentially use of null pointer\n\nThere is one call trace that snd_soc_register_card()\n-\u003esnd_soc_bind_card()-\u003esoc_init_pcm_runtime()\n-\u003esnd_soc_dai_compress_new()-\u003esnd_soc_new_compress().\nIn the trace the \u0027codec_dai\u0027 transfers from card-\u003edai_link,\nand we can see from the snd_soc_add_pcm_runtime() in\nsnd_soc_bind_card() that, if value of card-\u003edai_link-\u003enum_codecs\nis 0, then \u0027codec_dai\u0027 could be null pointer caused\nby index out of bound in \u0027asoc_rtd_to_codec(rtd, 0)\u0027.\nAnd snd_soc_register_card() is called by various platforms.\nTherefore, it is better to add the check in the case of misusing.\nAnd because \u0027cpu_dai\u0027 has already checked in soc_init_pcm_runtime(),\nthere is no need to check again.\nAdding the check as follow, then if \u0027codec_dai\u0027 is null,\nsnd_soc_new_compress() will not pass through the check\n\u0027if (playback + capture != 1)\u0027, avoiding the leftover use of\n\u0027codec_dai\u0027."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ASoC: soc-compress: evita el posible uso de un puntero nulo Hay un seguimiento de llamada que snd_soc_register_card() -\u0026gt;snd_soc_bind_card()-\u0026gt;soc_init_pcm_runtime() -\u0026gt;snd_soc_dai_compress_new()-\u0026gt;snd_soc_new_compress(). En el seguimiento, \u0027codec_dai\u0027 se transfiere desde card-\u0026gt;dai_link, y podemos ver desde snd_soc_add_pcm_runtime() en snd_soc_bind_card() que, si el valor de card-\u0026gt;dai_link-\u0026gt;num_codecs es 0, entonces \u0027codec_dai\u0027 podr\u00eda ser un puntero nulo causado por un \u00edndice fuera de los l\u00edmites en \u0027asoc_rtd_to_codec(rtd, 0)\u0027. Adem\u00e1s, varias plataformas llaman a snd_soc_register_card(), por lo que es mejor agregar la verificaci\u00f3n en caso de uso incorrecto. Y como \u0027cpu_dai\u0027 ya se ha verificado en soc_init_pcm_runtime(), no es necesario volver a verificar. Si se agrega la verificaci\u00f3n de la siguiente manera, si \u0027codec_dai\u0027 es nulo, snd_soc_new_compress() no pasar\u00e1 la verificaci\u00f3n \u0027if (playback + capture != 1)\u0027, lo que evita el uso sobrante de \u0027codec_dai\u0027."
    }
  ],
  "id": "CVE-2021-47650",
  "lastModified": "2025-09-23T18:47:36.830",
  "metrics": {
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          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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      "source": "nvd@nist.gov",
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}


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