GHSA-FF4J-XJHX-JPXP
Vulnerability from github – Published: 2025-09-23 21:30 – Updated: 2025-09-23 21:30In 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'.
{
"affected": [],
"aliases": [
"CVE-2021-47650"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-02-26T06:37:06Z",
"severity": "MODERATE"
},
"details": "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.",
"id": "GHSA-ff4j-xjhx-jpxp",
"modified": "2025-09-23T21:30:54Z",
"published": "2025-09-23T21:30:54Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47650"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/08af6da684b44097ea09f1d74d5858b837ed203b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4639c1d97f385f4784f44d66a3da0672f4951ada"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/68a69ad8df959e5211ed4a8e120783b2d352ea74"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/de2c6f98817fa5decb9b7d3b3a8a3ab864c10588"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f69a75cb8a98c6c487d620442c68595726a69f60"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/fc237b8d624f4bcb0f21a532627ce4e3b3a85569"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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