https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255875
Bug ID: 255875
Summary: [PATCH] netpfil/ipfw: Fix a double free in
aqm_codel_enqueue
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Created attachment 224938
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=224938&action=edit
adds a new label "out"
Bug File: sys/netpfil/ipfw/dn_aqm_codel.c
In function aqm_codel_enqueue, it calls m_freem() to free m and goto drop.
But in the drop branch, m is freed again via FREE_PKT(m) at 273, which is a
double free bug.
My patch adds a new label "out" and lets execution runs into the out branch
after m is freed, to avoid the double free bug.
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