ila: block BH in ila_output()

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: ila: block BH in ila_output() As explained in commit 1378817486d6 ("tipc: block BH before using dst_cache"), net/core/dst_cache.c helpers need to be called with BH disabled. ila_output() is called from lwtunnel_output() possibly from process context, and under rcu_read_lock(). We might be interrupted by a softirq, re-enter ila_output() and corrupt dst_cache data structures. Fix the race by using local_bh_disable().

References

• https://git.kernel.org/stable/c/7435bd2f84a25aba607030237261b3795ba782da
• https://git.kernel.org/stable/c/96103371091c6476eb07f4c66624bdd1b42f758a
• https://git.kernel.org/stable/c/a0cafb7b0b94d18e4813ee4b712a056f280e7b5a
• https://git.kernel.org/stable/c/feac2391e26b086f73be30e9b1ab215eada8d830
• https://git.kernel.org/stable/c/b4eb25a3d70df925a9fa4e82d17a958a0a228f5f
• https://git.kernel.org/stable/c/522c3336c2025818fa05e9daf0ac35711e55e316
• https://git.kernel.org/stable/c/9f9c79d8e527d867e0875868b14fb76e6011e70c
• https://git.kernel.org/stable/c/cf28ff8e4c02e1ffa850755288ac954b6ff0db8c