From 0ba7536d5d47e4ecf2259a80b207158dc4e711eb Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Mon, 7 Nov 2005 01:00:26 -0800 Subject: [PATCH] knfsd: Fix some minor sign problems in nfsd/xdr There are a couple of tests which could possibly be confused by extremely large numbers appearing in 'xdr' packets. I think the closest to an exploit you could get would be writing random data from a free page into a file - i.e. leak data out of kernel space. I'm fairly sure they cannot be used for remote compromise. Signed-off-by: Neil Brown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/nfsd/nfs3xdr.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'fs') diff --git a/fs/nfsd/nfs3xdr.c b/fs/nfsd/nfs3xdr.c index e0e134d6baba..9147b8524d05 100644 --- a/fs/nfsd/nfs3xdr.c +++ b/fs/nfsd/nfs3xdr.c @@ -366,7 +366,8 @@ nfs3svc_decode_writeargs(struct svc_rqst *rqstp, u32 *p, len = args->len = ntohl(*p++); hdr = (void*)p - rqstp->rq_arg.head[0].iov_base; - if (rqstp->rq_arg.len < len + hdr) + if (rqstp->rq_arg.len < hdr || + rqstp->rq_arg.len - hdr < len) return 0; args->vec[0].iov_base = (void*)p; -- cgit v1.2.3