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charset="UTF-8" Content-Transfer-Encoding: quoted-printable The commit message has: > tipc: Fix use-after-free of kernel socket in cleanup_bearer(). > > syzkaller reported a use-after-free of UDP kernel socket > in cleanup_bearer() without repro. [0][1] > > When bearer_disable() calls tipc_udp_disable(), cleanup > of the UDP kernel socket is deferred by work calling > cleanup_bearer(). > > tipc_net_stop() waits for such works to finish by checking > tipc_net(net)->wq_count. However, the work decrements the > count too early before releasing the kernel socket, > unblocking cleanup_net() and resulting in use-after-free. This is incorrect, the function which waits is tipc_exit_net, which has the spinning while loop. That function is an exit function so this can't be triggered without privileges. Could it be grounds for rejection? Probably not but I thought I should ask. > Fixes: 26abe14379f8 ("net: Modify sk_alloc to not reference count the net= ns of kernel sockets.") The fixes tag is incorrect. It should be the commit which adds the counter, which is: 04c26faa51d1 ("tipc: wait and exit until all work queues are done") Maybe this needs to be corrected in the JSONs (as the commits are set in stone). 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