Bug 2407343 (CVE-2025-40101)

Summary: CVE-2025-40101 kernel: btrfs: fix memory leaks when rejecting a non SINGLE data profile without an RST
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 2025-10-30 10:02:43 UTC 
In the Linux kernel, the following vulnerability has been resolved:

btrfs: fix memory leaks when rejecting a non SINGLE data profile without an RST

At the end of btrfs_load_block_group_zone_info() the first thing we do
is to ensure that if the mapping type is not a SINGLE one and there is
no RAID stripe tree, then we return early with an error.

Doing that, though, prevents the code from running the last calls from
this function which are about freeing memory allocated during its
run. Hence, in this case, instead of returning early, we set the ret
value and fall through the rest of the cleanup code.
Comment 1 Jon Moroney 2025-10-30 16:27:52 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025103017-CVE-2025-40101-d0c0@gregkh/T