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2021-05-23T13:01:20.358254Z
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netgraph/ng_checksum: Fix double free error

m_pullup(9) frees the mbuf(9) chain in the case of an allocation error.
The mbuf chain must not be freed again in this case.

PR:		255874
Submitted by:	<lylgood@foxmail.com>
Approved by:	markj
Differential Revision: https://reviews.freebsd.org/D30273

(cherry picked from commit 687e510e5ce32fddf46a9dc1d517ccc8a8e25581)

Git Hash:   76b96a4ec7fa8cffbfe8e876d622fd4e69f25267
Git Author: donner@FreeBSD.org
END