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- Utilize m_get2(), accidentially fixing some signedness bugs.

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- Return EMSGSIZE in both cases if uio_resid is oversized or undersized.
- No need to clear rcvif.
This commit is contained in:
Gleb Smirnoff 2013-01-24 14:29:31 +00:00
parent d30a6b30fc
commit ed63043b21
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=245878
1 changed files with 3 additions and 20 deletions
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23
sys/net/bpf.c
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@ -522,32 +522,15 @@ bpf_movein(struct uio *uio, int linktype, struct ifnet *ifp, struct mbuf **mp,
}
len = uio->uio_resid;
if (len - hlen > ifp->if_mtu)
if (len < hlen || len - hlen > ifp->if_mtu)
return (EMSGSIZE);
if ((unsigned)len > MJUM16BYTES)
m = m_get2(M_WAITOK, MT_DATA, M_PKTHDR, len);
if (m == NULL)
return (EIO);
if (len <= MHLEN)
MGETHDR(m, M_WAITOK, MT_DATA);
else if (len <= MCLBYTES)
m = m_getcl(M_WAITOK, MT_DATA, M_PKTHDR);
else
m = m_getjcl(M_WAITOK, MT_DATA, M_PKTHDR,
#if (MJUMPAGESIZE > MCLBYTES)
len <= MJUMPAGESIZE ? MJUMPAGESIZE :
#endif
(len <= MJUM9BYTES ? MJUM9BYTES : MJUM16BYTES));
m->m_pkthdr.len = m->m_len = len;
m->m_pkthdr.rcvif = NULL;
*mp = m;
if (m->m_len < hlen) {
error = EPERM;
goto bad;
}
error = uiomove(mtod(m, u_char *), len, uio);
if (error)
goto bad;