diff options
| author | Bruce Rogers <brogers@novell.com> | 2011-02-05 14:47:56 -0700 |
|---|---|---|
| committer | Justin M. Forbes <jforbes@redhat.com> | 2011-02-14 14:19:12 -0600 |
| commit | bd2483faf127abe9fa5abc3c8e199f5e7d6534d3 (patch) | |
| tree | 7227d739f5245df81f7f3173ca171c04205f9086 | |
| parent | 7083b66b45571c610cc0a9dedff761da8ebe013f (diff) | |
PATCH] slirp: fix buffer overrun
Since the addition of the slirp member to struct mbuf, the value of
SLIRP_MSIZE and the initialization of m_size have not been correct,
resulting in overrunning the end of the malloc'd buffer in some cases.
Signed-off-by: Bruce Rogers <brogers@novell.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
| -rw-r--r-- | slirp/mbuf.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/slirp/mbuf.c b/slirp/mbuf.c index 87508ba013..eadc802241 100644 --- a/slirp/mbuf.c +++ b/slirp/mbuf.c @@ -23,7 +23,7 @@ * Find a nice value for msize * XXX if_maxlinkhdr already in mtu */ -#define SLIRP_MSIZE (IF_MTU + IF_MAXLINKHDR + sizeof(struct m_hdr ) + 6) +#define SLIRP_MSIZE (IF_MTU + IF_MAXLINKHDR + offsetof(struct mbuf, m_dat) + 6) void m_init(Slirp *slirp) @@ -65,7 +65,7 @@ m_get(Slirp *slirp) m->m_flags = (flags | M_USEDLIST); /* Initialise it */ - m->m_size = SLIRP_MSIZE - sizeof(struct m_hdr); + m->m_size = SLIRP_MSIZE - offsetof(struct m_hdr, m_dat); m->m_data = m->m_dat; m->m_len = 0; m->m_nextpkt = NULL; |