Bug 2338850 (CVE-2024-57927)

Summary: CVE-2024-57927 kernel: nfs: Fix oops in nfs_netfs_init_request() when copying to cache
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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OS: Linux   
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Description OSIDB Bzimport 2025-01-19 12:02:14 UTC 
In the Linux kernel, the following vulnerability has been resolved:

nfs: Fix oops in nfs_netfs_init_request() when copying to cache

When netfslib wants to copy some data that has just been read on behalf of
nfs, it creates a new write request and calls nfs_netfs_init_request() to
initialise it, but with a NULL file pointer.  This causes
nfs_file_open_context() to oops - however, we don't actually need the nfs
context as we're only going to write to the cache.

Fix this by just returning if we aren't given a file pointer and emit a
warning if the request was for something other than copy-to-cache.

Further, fix nfs_netfs_free_request() so that it doesn't try to free the
context if the pointer is NULL.
Comment 1 Avinash Hanwate 2025-01-20 05:12:38 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025011944-CVE-2024-57927-fb00@gregkh/T