Bug 2420313 (CVE-2022-50670)

Summary: CVE-2022-50670 kernel: mmc: omap_hsmmc: 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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Priority: low    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the OMAP HSMMC driver in the Linux kernel. The driver does not check the return value of mmc_add_host(), which can lead to a memory leak from mmc_alloc_host() and a null pointer dereference crash in mmc_remove_host() when attempting to remove a device that was never successfully added.
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Description OSIDB Bzimport 2025-12-09 02:02:16 UTC 
In the Linux kernel, the following vulnerability has been resolved:

mmc: omap_hsmmc: 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().

Fix this by checking the return value and goto error path wihch
will call mmc_free_host().
Comment 1 Alexander B 2025-12-10 02:20:56 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025120946-CVE-2022-50670-feb4@gregkh/T