The fix was already released as part of 4.4.0-190.220 for the upstream
stable update from bug #1892822.
** Changed in: linux (Ubuntu Xenial)
Status: New => Fix Released
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** Also affects: linux (Ubuntu Xenial)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1888715
Title:
UDP data corruption caused by buggy udp_r
FYI: the fix is in the upstream linux-4.4.y branch now:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v4.4.233&id=c514bb4147e2c667cf82f9aa7689cf442078c13f
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https://lore.kernel.org/netdev/20200728015505.37830-1-de...@microsoft.com/
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https://bugs.launchpad.net/bugs/1888715
Title:
UDP data corruption caused by buggy udp_recvmsg()
rcu_access_pointer(sk->sk_filter) is basically the same as
sk->sk_filter.
If sk->sk_filter is true, the change makes no difference.
If sk->sk_filter is false, the change also drops a UDP packet with incorrect
UDP checksum by "goto csum_error;". Without the change, the packet is dropped
in udp_re
Hello Dexuan, wonderful, thanks;
Eric's proposed patch confuses me on one point:
- if (rcu_access_pointer(sk->sk_filter) &&
- udp_lib_checksum_complete(skb))
+ if (udp_lib_checksum_complete(skb))
goto csum_error;
Do you know why the rcu_access_pointer() call
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