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Description: qeth: fix L3 next-hop im xmit qeth hdr
Symptom: wrong destination address in qdio header
Problem: The current code accesses rtable->rt_gateway without checking
that rtable is a valid address. The accidental access to a
lowcore area results in a random next-hop address in the
qeth_hdr.
rtable (or more precisely, skb_dst(skb)) can be NULL in rare
cases (for instance together with AF_PACKET sockets).
Solution: Add the missing NULL-ptr checks.
Reproduction: AF_PACKET program sending raw data
Upstream Commit:
ec2c6726322f0d270bab477e4904bf9496f70ee5
kernel 4.13
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Skipper Bug Screeners (skipper-screen-team)
Status: New
** Tags: architecture-s39064 bugnameltc-164873 severity-high
targetmilestone-inin1804
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qeth: fix L3 next-hop im xmit qeth hdr
https://bugs.launchpad.net/bugs/1750813
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