Bug 2426159 (CVE-2023-54185)

Summary: CVE-2023-54185 kernel: btrfs: remove BUG_ON()'s in add_new_free_space()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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Description OSIDB Bzimport 2025-12-30 13:13:12 UTC 
In the Linux kernel, the following vulnerability has been resolved:

btrfs: remove BUG_ON()'s in add_new_free_space()

At add_new_free_space() we have these BUG_ON()'s that are there to deal
with any failure to add free space to the in memory free space cache.
Such failures are mostly -ENOMEM that should be very rare. However there's
no need to have these BUG_ON()'s, we can just return any error to the
caller and all callers and their upper call chain are already dealing with
errors.

So just make add_new_free_space() return any errors, while removing the
BUG_ON()'s, and returning the total amount of added free space to an
optional u64 pointer argument.
Comment 1 Alexander B 2025-12-31 04:51:10 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025123025-CVE-2023-54185-3c5c@gregkh/T