https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255863
Bug ID: 255863
Summary: [PATCH] dev/cxgb: Fix a use after free in get_packet
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Created attachment 224927
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=224927&action=edit
add new variables to avoid uaf.
Bug File: sys/dev/cxgb/cxgb_sge.c
In function get_packet, m is freed via m_freem() at line 2,775 in the case
RSPQ_NSOP_NEOP. However, the freed m is used in m->m_len and m->m_pkthdr.len
in printf(). This is a use after free bug and could print security-sensitive
information. Alough it exist in debug mode, it is worthy to fix it.
My patch uses "m_len = m->m_len" and "m_pkthdr_len = m->m_pkthdr.len" to avoid
the uaf bug.
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