Author: kib
Date: Fri Feb 1 16:57:02 2013
New Revision: 246213
URL: http://svnweb.freebsd.org/changeset/base/246213
Log:
Assert that the mbuf in the chain has sane length. Proper place for
this check is somewhere in the network code, but this assertion
already proven to be useful in catching what seems to be driver bugs
causing NFS scrambling random memory.
Discussed with: rmacklem
MFC after: 1 week
Modified:
head/sys/fs/nfs/nfs_commonsubs.c
Modified: head/sys/fs/nfs/nfs_commonsubs.c
==============================================================================
--- head/sys/fs/nfs/nfs_commonsubs.c Fri Feb 1 16:48:55 2013
(r246212)
+++ head/sys/fs/nfs/nfs_commonsubs.c Fri Feb 1 16:57:02 2013
(r246213)
@@ -218,6 +218,7 @@ nfsm_mbufuio(struct nfsrv_descript *nd,
}
mbufcp = NFSMTOD(mp, caddr_t);
len = mbuf_len(mp);
+ KASSERT(len > 0, ("len %d", len));
}
xfer = (left > len) ? len : left;
#ifdef notdef
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