https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255880
Bug ID: 255880
Summary: [PATCH] netpfil/ipfw: Fix a double free in pie_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 224943
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=224943&action=edit
avoid the m been freed again
Bug File: sys/netpfil/ipfw/dn_sched_fq_pie.c
In function pie_enqueue, m is freed via m_freem() at line 737.
But the freed m is freed again via FREE_PKT() at line 751, which is a double
free bug.
My patch returns the allocation error of m_tag_alloc() after m_freem(m), to
avoid the m been freed again.
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