EUVD-2022-55694
Lifecycle Timeline
3Description
In the Linux kernel, the following vulnerability has been resolved: mmc: meson-gx: 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 which will call mmc_free_host().
Analysis
In the Linux kernel, the following vulnerability has been resolved:
mmc: meson-gx: 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:
- The memory that allocated in mmc_alloc_host() is leaked.
- 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 which will call mmc_free_host().
Technical Context
A denial of service vulnerability allows an attacker to disrupt the normal functioning of a system, making it unavailable to legitimate users.
Remediation
Implement rate limiting and input validation. Use timeout mechanisms for resource-intensive operations. Deploy DDoS protection where applicable.
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External POC / Exploit Code
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