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| author | Eric Dumazet <edumazet@google.com> | 2024-05-31 13:26:34 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-07-05 09:00:20 +0200 |
| commit | 6330fe95e59bc1de5ad3ebd89e379d785c7c6fc0 (patch) | |
| tree | 5e3233fe23abe8c116cd67aefa63b5c49c9928a4 /net/unix/af_unix.c | |
| parent | 15b37c6fab9d5e40ac399fa1c725118588ed649c (diff) | |
ipv6: sr: block BH in seg6_output_core() and seg6_input_core()
[ Upstream commit c0b98ac1cc104f48763cdb27b1e9ac25fd81fc90 ]
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.
Disabling preemption in seg6_output_core() is not good enough,
because seg6_output_core() is called from process context,
lwtunnel_output() only uses rcu_read_lock().
We might be interrupted by a softirq, re-enter seg6_output_core()
and corrupt dst_cache data structures.
Fix the race by using local_bh_disable() instead of
preempt_disable().
Apply a similar change in seg6_input_core().
Fixes: fa79581ea66c ("ipv6: sr: fix several BUGs when preemption is enabled")
Fixes: 6c8702c60b88 ("ipv6: sr: add support for SRH encapsulation and injection with lwtunnels")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: David Lebrun <dlebrun@google.com>
Acked-by: Paolo Abeni <pabeni@redhat.com>
Link: https://lore.kernel.org/r/20240531132636.2637995-4-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'net/unix/af_unix.c')
0 files changed, 0 insertions, 0 deletions