Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: batman-adv: bla: fix report_work leak on backbone_gw purge batadv_bla_purge_backbone_gw() removes stale backbone gateway entries, but fails to properly handle their associated report_work: - If report_work is running, the purge must wait for it to finish before freeing the backbone_gw, otherwise the worker may access freed memory (e.g. bat_priv). - If report_work is pending, the purge must cancel it and release the reference held for that pending work item. The previous implementation called hlist_for_each_entry_safe() inside a spin_lock_bh() section, but cancel_work_sync() may sleep and therefore cannot be called from within a spinlock-protected region. Restructure the loop to handle one entry per spinlock critical section: acquire the lock, find the next entry to purge, remove it from the hash list, then release the lock before calling cancel_work_sync() and dropping the hash_entry reference. Repeat until no more entries require purging.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 23721387c409087fd3b97e274f34d3ddc0970b74 before ce2c0ee4d76d5ee4b391fe0e31334361e25030ec; affected 23721387c409087fd3b97e274f34d3ddc0970b74 before 3423a45e5c3d3c5129f88143a9a969787d7d5a0a; affected 23721387c409087fd3b97e274f34d3ddc0970b74 before f1303adb1e59582f76c22798a2e2e150e054a9e7; affected 23721387c409087fd3b97e274f34d3ddc0970b74 before 48663158222b3b7f6ee6791a67d512ede7fc94bb; affected 23721387c409087fd3b97e274f34d3ddc0970b74 before eeddd7bab3d59c1e98642a204141f8c5d6194707; affected 23721387c409087fd3b97e274f34d3ddc0970b74 before c6de1a5a9c406e30b91f1515a6ce05cc84023baa; affected 23721387c409087fd3b97e274f34d3ddc0970b74 before 95a7034661274cf5985708bd2f6d86ee46f88fa9; affected 23721387c409087fd3b97e274f34d3ddc0970b74 before 0459430add32ea41f3e2ef9351610e6d33627a6b |
| Linux / Linux | affected 3.5; unaffected 0 before 3.5; unaffected 5.10.258 through 5.10.*; unaffected 5.15.209 through 5.15.*; unaffected 6.1.175 through 6.1.*; unaffected 6.6.142 through 6.6.*; unaffected 6.12.92 through 6.12.*; unaffected 6.18.34 through 6.18.*; unaffected 7.0.11 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/ce2c0ee4d76d5ee4b391fe0e31334361e25030ec
- https://git.kernel.org/stable/c/3423a45e5c3d3c5129f88143a9a969787d7d5a0a
- https://git.kernel.org/stable/c/f1303adb1e59582f76c22798a2e2e150e054a9e7
- https://git.kernel.org/stable/c/48663158222b3b7f6ee6791a67d512ede7fc94bb
- https://git.kernel.org/stable/c/eeddd7bab3d59c1e98642a204141f8c5d6194707
- https://git.kernel.org/stable/c/c6de1a5a9c406e30b91f1515a6ce05cc84023baa
- https://git.kernel.org/stable/c/95a7034661274cf5985708bd2f6d86ee46f88fa9
- https://git.kernel.org/stable/c/0459430add32ea41f3e2ef9351610e6d33627a6b