Description
In the Linux kernel, the following vulnerability has been resolved: batman-adv: hold claim backbone gateways by reference batadv_bla_add_claim() can replace claim->backbone_gw and drop the old gateway's last reference while readers still follow the pointer. The netlink claim dump path dereferences claim->backbone_gw->orig and takes claim->backbone_gw->crc_lock without pinning the underlying backbone gateway. batadv_bla_check_claim() still has the same naked pointer access pattern. Reuse batadv_bla_claim_get_backbone_gw() in both readers so they operate on a stable gateway reference until the read-side work is complete. This keeps the dump and claim-check paths aligned with the lifetime rules introduced for the other BLA claim readers.
Product status
23721387c409087fd3b97e274f34d3ddc0970b74 (git) before f4858832ddef2f39f21e30b7226bbcd3c4b2bc96
23721387c409087fd3b97e274f34d3ddc0970b74 (git) before 2f55b58b5a0bbed192d60c444a45a49cdf1b545f
23721387c409087fd3b97e274f34d3ddc0970b74 (git) before 7962b522222628596ca9ecc8722efc95367aadbd
23721387c409087fd3b97e274f34d3ddc0970b74 (git) before 4dee4c0688443aaf5bbec74aa203c851d1d53c35
23721387c409087fd3b97e274f34d3ddc0970b74 (git) before 1f2dc36c297d27733f1b380ea644cf15a361bd7b
23721387c409087fd3b97e274f34d3ddc0970b74 (git) before 82d8701b2c930d0e96b0dbc9115a218d791cb0d2
3.5
Any version before 3.5
6.1.169 (semver)
6.6.135 (semver)
6.12.82 (semver)
6.18.23 (semver)
6.19.13 (semver)
7.0 (original_commit_for_fix)
References
git.kernel.org/...c/f4858832ddef2f39f21e30b7226bbcd3c4b2bc96
git.kernel.org/...c/2f55b58b5a0bbed192d60c444a45a49cdf1b545f
git.kernel.org/...c/7962b522222628596ca9ecc8722efc95367aadbd
git.kernel.org/...c/4dee4c0688443aaf5bbec74aa203c851d1d53c35
git.kernel.org/...c/1f2dc36c297d27733f1b380ea644cf15a361bd7b
git.kernel.org/...c/82d8701b2c930d0e96b0dbc9115a218d791cb0d2