[SRU][Bionic][PATCH 0/1] Fix WARN_ON in sk_stream_kill_queues

[Andrei Gherzan]

BugLink: https://bugs.launchpad.net/bugs/2020279

[Impact]

The upstream commit 323fbd0edf3f ("net: dccp: Add handling of
IPV6_PKTOPTIONS to dccp_v6_do_rcv()") started to trigger WARN_ON in
sk_stream_kill_queues. Bionic doesn't have this commit but the same is
triggered with ca43ccf41224b023fc290073d5603a755fd12eed ("dccp/tcp:
Avoid negative sk_forward_alloc by ipv6_pinfo.pktoptions.") which is
included in Bionic.

[Fix]

Upstream already has the fix merged and also backported in various versions
including 4.14 from which the fix was cherry-picked for the Ubuntu
Bionic tree.

[Test Plan]

The bug was reproduced, and the fix was validated with the program
referenced in the patch's description:
https://lore.kernel.org/netdev/20230208004245.83497-1-kuniyu@amazon.com/

[Where problems could occur]

The regression can be considered low, since this commit was backported
on various versions from 4.14 to 6.2 (where the initial fix landed) and
has been both reproduced and validated at runtime.

[Other Info]

All the Ubuntu kernel trees have been checked for this bug and only
Bionic is affected. The earlier tree don't have the commits that trigger
this bug while the later trees already include the fix.

Kuniyuki Iwashima (1):
  net: Remove WARN_ON_ONCE(sk->sk_forward_alloc) from
    sk_stream_kill_queues().

 net/caif/caif_socket.c | 1 +
 net/core/stream.c      | 1 -
 2 files changed, 1 insertion(+), 1 deletion(-)

-- 
2.34.1