diff options
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/kern/subr_mbuf.c | 10 | ||||
| -rw-r--r-- | sys/sys/mbuf.h | 1 |
2 files changed, 11 insertions, 0 deletions
diff --git a/sys/kern/subr_mbuf.c b/sys/kern/subr_mbuf.c index 5d593e6..5d624f6 100644 --- a/sys/kern/subr_mbuf.c +++ b/sys/kern/subr_mbuf.c @@ -1380,6 +1380,11 @@ m_free(struct mbuf *mb) int cchnum; short persist = 0; +#ifdef INVARIANTS + if (mb->m_flags & M_FREELIST) + panic("m_free detected a mbuf double-free"); + mb->m_flags |= M_FREELIST; +#endif if ((mb->m_flags & M_PKTHDR) != 0) m_tag_delete_chain(mb, NULL); nb = mb->m_next; @@ -1422,6 +1427,11 @@ m_freem(struct mbuf *mb) short persist; while (mb != NULL) { +#ifdef INVARIANTS + if (mb->m_flags & M_FREELIST) + panic("m_freem detected a mbuf double-free"); + mb->m_flags |= M_FREELIST; +#endif if ((mb->m_flags & M_PKTHDR) != 0) m_tag_delete_chain(mb, NULL); persist = 0; diff --git a/sys/sys/mbuf.h b/sys/sys/mbuf.h index a00534a..8a27462 100644 --- a/sys/sys/mbuf.h +++ b/sys/sys/mbuf.h @@ -153,6 +153,7 @@ struct mbuf { #define M_PROTO3 0x0040 /* protocol-specific */ #define M_PROTO4 0x0080 /* protocol-specific */ #define M_PROTO5 0x0100 /* protocol-specific */ +#define M_FREELIST 0x4000 /* mbuf is on the free list */ /* * mbuf pkthdr flags (also stored in m_flags). |
