CVE - CVE-2021-47650

CVE-ID
CVE-2021-47650	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/08af6da684b44097ea09f1d74d5858b837ed203b URL:https://git.kernel.org/stable/c/08af6da684b44097ea09f1d74d5858b837ed203b MISC:https://git.kernel.org/stable/c/4639c1d97f385f4784f44d66a3da0672f4951ada URL:https://git.kernel.org/stable/c/4639c1d97f385f4784f44d66a3da0672f4951ada MISC:https://git.kernel.org/stable/c/68a69ad8df959e5211ed4a8e120783b2d352ea74 URL:https://git.kernel.org/stable/c/68a69ad8df959e5211ed4a8e120783b2d352ea74 MISC:https://git.kernel.org/stable/c/de2c6f98817fa5decb9b7d3b3a8a3ab864c10588 URL:https://git.kernel.org/stable/c/de2c6f98817fa5decb9b7d3b3a8a3ab864c10588 MISC:https://git.kernel.org/stable/c/f69a75cb8a98c6c487d620442c68595726a69f60 URL:https://git.kernel.org/stable/c/f69a75cb8a98c6c487d620442c68595726a69f60 MISC:https://git.kernel.org/stable/c/fc237b8d624f4bcb0f21a532627ce4e3b3a85569 URL:https://git.kernel.org/stable/c/fc237b8d624f4bcb0f21a532627ce4e3b3a85569
Assigning CNA
kernel.org
Date Record Created
20250226	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20250226)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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