CVE-2026-98082btrfs: fix the possible bioc_list memory leak during error

Official description

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix the possible bioc_list memory leak during error There are two possible ways to leak bioc memory on btrfs_ordered_extent::bioc_list: - An error occurred for btrfs_insert_one_raid_extent() Then the function btrfs_insert_raid_extent() immediately return without freeing any bioc in the bioc_list. - An ordered extent hit an IO error In that case the ordered extent will have BTRFS_ORDERED_IOERR set, and skip the call on btrfs_insert_raid_extent() completely. Fix the problem by: - Introduce a new helper, btrfs_cleanup_ordered_bioc_list() Which will remove all bioc from the bioc_list, and release the bioc. - Call the above helper for btrfs_insert_raid_extent() So that the cleanup helper is always called no matter what. - Call the above helper for btrfs_finish_one_ordered() This is called just before the final release on the ordered extent. This was reported by Sashiko when reviewing another patch.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/d043c43d2b4ebcd75ee7f907948ef2847306d6b2
• https://git.kernel.org/stable/c/83f0c973cffb184d019390ffdb5d31de5c85bc61
• https://git.kernel.org/stable/c/1b4d4e890c2c85d0f6365b5a08c48b4bbf85deb0
• https://git.kernel.org/stable/c/bb4da45766d16503821f167054db76b735d89e94
• https://git.kernel.org/stable/c/afbe73778338e6d1ac8c4486fbdf33f0cc1f2624