{"id":"CVE-2021-47650","state":"PUBLISHED","title":"ASoC: soc-compress: prevent the potentially use of null pointer","description":"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->snd_soc_bind_card()->soc_init_pcm_runtime()\n->snd_soc_dai_compress_new()->snd_soc_new_compress().\nIn the trace the 'codec_dai' transfers from card->dai_link,\nand we can see from the snd_soc_add_pcm_runtime() in\nsnd_soc_bind_card() that, if value of card->dai_link->num_codecs\nis 0, then 'codec_dai' could be null pointer caused\nby index out of bound in 'asoc_rtd_to_codec(rtd, 0)'.\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 'cpu_dai' has already checked in soc_init_pcm_runtime(),\nthere is no need to check again.\nAdding the check as follow, then if 'codec_dai' is null,\nsnd_soc_new_compress() will not pass through the check\n'if (playback + capture != 1)', avoiding the leftover use of\n'codec_dai'.","publishedAt":"2025-02-26T01:54:17.052Z","updatedAt":"2026-05-11T13:58:36.267Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"467fece8fbc6774a3a3bd0981e1a342fb5022706","status":"affected","lessThan":"68a69ad8df959e5211ed4a8e120783b2d352ea74","versionType":"git"},{"version":"467fece8fbc6774a3a3bd0981e1a342fb5022706","status":"affected","lessThan":"4639c1d97f385f4784f44d66a3da0672f4951ada","versionType":"git"},{"version":"467fece8fbc6774a3a3bd0981e1a342fb5022706","status":"affected","lessThan":"fc237b8d624f4bcb0f21a532627ce4e3b3a85569","versionType":"git"},{"version":"467fece8fbc6774a3a3bd0981e1a342fb5022706","status":"affected","lessThan":"08af6da684b44097ea09f1d74d5858b837ed203b","versionType":"git"},{"version":"467fece8fbc6774a3a3bd0981e1a342fb5022706","status":"affected","lessThan":"f69a75cb8a98c6c487d620442c68595726a69f60","versionType":"git"},{"version":"467fece8fbc6774a3a3bd0981e1a342fb5022706","status":"affected","lessThan":"de2c6f98817fa5decb9b7d3b3a8a3ab864c10588","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/soc/soc-compress.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.4","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.4","versionType":"semver"},{"version":"5.4.189","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.110","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.33","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.16.19","status":"unaffected","lessThanOrEqual":"5.16.*","versionType":"semver"},{"version":"5.17.2","status":"unaffected","lessThanOrEqual":"5.17.*","versionType":"semver"},{"version":"5.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/soc/soc-compress.c"]}],"references":["https://git.kernel.org/stable/c/68a69ad8df959e5211ed4a8e120783b2d352ea74","https://git.kernel.org/stable/c/4639c1d97f385f4784f44d66a3da0672f4951ada","https://git.kernel.org/stable/c/fc237b8d624f4bcb0f21a532627ce4e3b3a85569","https://git.kernel.org/stable/c/08af6da684b44097ea09f1d74d5858b837ed203b","https://git.kernel.org/stable/c/f69a75cb8a98c6c487d620442c68595726a69f60","https://git.kernel.org/stable/c/de2c6f98817fa5decb9b7d3b3a8a3ab864c10588"],"weaknesses":[],"ingestedAt":"2026-10-29T19:49:19.404Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/47xxx/CVE-2021-47650.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2021-47650","state":"PUBLISHED","datePublished":"2025-02-26T01:54:17.052Z","dateUpdated":"2026-05-11T13:58:36.267Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-02-26T01:48:21.520Z"},"containers":{"cna":{"title":"ASoC: soc-compress: prevent the potentially use of null pointer","descriptions":[{"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->snd_soc_bind_card()->soc_init_pcm_runtime()\n->snd_soc_dai_compress_new()->snd_soc_new_compress().\nIn the trace the 'codec_dai' transfers from card->dai_link,\nand we can see from the snd_soc_add_pcm_runtime() in\nsnd_soc_bind_card() that, if value of card->dai_link->num_codecs\nis 0, then 'codec_dai' could be null pointer caused\nby index out of bound in 'asoc_rtd_to_codec(rtd, 0)'.\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 'cpu_dai' has already checked in soc_init_pcm_runtime(),\nthere is no need to check again.\nAdding the check as follow, then if 'codec_dai' is null,\nsnd_soc_new_compress() will not pass through the check\n'if (playback + capture != 1)', avoiding the leftover use of\n'codec_dai'."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"467fece8fbc6774a3a3bd0981e1a342fb5022706","status":"affected","lessThan":"68a69ad8df959e5211ed4a8e120783b2d352ea74","versionType":"git"},{"version":"467fece8fbc6774a3a3bd0981e1a342fb5022706","status":"affected","lessThan":"4639c1d97f385f4784f44d66a3da0672f4951ada","versionType":"git"},{"version":"467fece8fbc6774a3a3bd0981e1a342fb5022706","status":"affected","lessThan":"fc237b8d624f4bcb0f21a532627ce4e3b3a85569","versionType":"git"},{"version":"467fece8fbc6774a3a3bd0981e1a342fb5022706","status":"affected","lessThan":"08af6da684b44097ea09f1d74d5858b837ed203b","versionType":"git"},{"version":"467fece8fbc6774a3a3bd0981e1a342fb5022706","status":"affected","lessThan":"f69a75cb8a98c6c487d620442c68595726a69f60","versionType":"git"},{"version":"467fece8fbc6774a3a3bd0981e1a342fb5022706","status":"affected","lessThan":"de2c6f98817fa5decb9b7d3b3a8a3ab864c10588","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/soc/soc-compress.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.4","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.4","versionType":"semver"},{"version":"5.4.189","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.110","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.33","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.16.19","status":"unaffected","lessThanOrEqual":"5.16.*","versionType":"semver"},{"version":"5.17.2","status":"unaffected","lessThanOrEqual":"5.17.*","versionType":"semver"},{"version":"5.18","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["sound/soc/soc-compress.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/68a69ad8df959e5211ed4a8e120783b2d352ea74"},{"url":"https://git.kernel.org/stable/c/4639c1d97f385f4784f44d66a3da0672f4951ada"},{"url":"https://git.kernel.org/stable/c/fc237b8d624f4bcb0f21a532627ce4e3b3a85569"},{"url":"https://git.kernel.org/stable/c/08af6da684b44097ea09f1d74d5858b837ed203b"},{"url":"https://git.kernel.org/stable/c/f69a75cb8a98c6c487d620442c68595726a69f60"},{"url":"https://git.kernel.org/stable/c/de2c6f98817fa5decb9b7d3b3a8a3ab864c10588"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T13:58:36.267Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"5.4.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"5.10.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"5.15.33"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"5.16.19"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"5.17.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4","versionEndExcluding":"5.18"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}