Bug 2420261 (CVE-2022-50653)

Summary: CVE-2022-50653 kernel: mmc: atmel-mci: fix return value check of mmc_add_host()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-12-09 01:04:06 UTC 
In the Linux kernel, the following vulnerability has been resolved:

mmc: atmel-mci: fix return value check of mmc_add_host()

mmc_add_host() may return error, if we ignore its return value,
it will lead two issues:
1. The memory that allocated in mmc_alloc_host() is leaked.
2. In the remove() path, mmc_remove_host() will be called to
   delete device, but it's not added yet, it will lead a kernel
   crash because of null-ptr-deref in device_del().

So fix this by checking the return value and calling mmc_free_host()
in the error path.
Comment 1 Alexander B 2025-12-10 06:31:19 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025120938-CVE-2022-50653-6da2@gregkh/T