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[Bug 2017013] [NEW] net: sched: Fix use after free in red_enqueue()

 

Public bug reported:

We can't use "skb" again after passing it to qdisc_enqueue().  This is
basically identical to commit 2f09707 ("sch_sfb: Also store skb
len before calling child enqueue").

Fixes: d7f4f33 ("sch_red: update backlog as well")

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete

** Affects: linux (Ubuntu Xenial)
     Importance: High
     Assignee: Cengiz Can (cengizcan)
         Status: In Progress

** Package changed: linux-azure (Ubuntu) => linux (Ubuntu)

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Xenial)
       Status: New => In Progress

** Changed in: linux (Ubuntu Xenial)
   Importance: Undecided => High

** Changed in: linux (Ubuntu Xenial)
     Assignee: (unassigned) => Cengiz Can (cengizcan)

** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2022-3586

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https://bugs.launchpad.net/bugs/2017013

Title:
  net: sched: Fix use after free in red_enqueue()

Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Xenial:
  In Progress

Bug description:
  We can't use "skb" again after passing it to qdisc_enqueue().  This is
  basically identical to commit 2f09707 ("sch_sfb: Also store skb
  len before calling child enqueue").

  Fixes: d7f4f33 ("sch_red: update backlog as well")

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