From: Chuck Lever <chuck.lever@oracle.com>
Date: Wed, 29 Jun 2016 17:54:33 +0000 (-0400)
Subject: xprtrdma: rpcrdma_inline_fixup() overruns the receive page list
X-Git-Tag: v4.14-rc1~2651^2~13^2~1^2~6
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=80414abc2848f43690c8402a77d37710ad0020c2;p=platform%2Fkernel%2Flinux-rpi.git

xprtrdma: rpcrdma_inline_fixup() overruns the receive page list

When the remaining length of an incoming reply is longer than the
XDR buf's page_len, switch over to the tail iovec instead of
copying more than page_len bytes into the page list.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Tested-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
---

diff --git a/net/sunrpc/xprtrdma/rpc_rdma.c b/net/sunrpc/xprtrdma/rpc_rdma.c
index f60d229..e3560c2 100644
--- a/net/sunrpc/xprtrdma/rpc_rdma.c
+++ b/net/sunrpc/xprtrdma/rpc_rdma.c
@@ -773,12 +773,17 @@ rpcrdma_inline_fixup(struct rpc_rqst *rqst, char *srcp, int copy_len, int pad)
 	page_base &= ~PAGE_MASK;
 
 	if (copy_len && rqst->rq_rcv_buf.page_len) {
-		npages = PAGE_ALIGN(page_base +
-			rqst->rq_rcv_buf.page_len) >> PAGE_SHIFT;
+		int pagelist_len;
+
+		pagelist_len = rqst->rq_rcv_buf.page_len;
+		if (pagelist_len > copy_len)
+			pagelist_len = copy_len;
+		npages = PAGE_ALIGN(page_base + pagelist_len) >> PAGE_SHIFT;
 		for (; i < npages; i++) {
 			curlen = PAGE_SIZE - page_base;
-			if (curlen > copy_len)
-				curlen = copy_len;
+			if (curlen > pagelist_len)
+				curlen = pagelist_len;
+
 			dprintk("RPC:       %s: page %d"
 				" srcp 0x%p len %d curlen %d\n",
 				__func__, i, srcp, copy_len, curlen);
@@ -788,7 +793,8 @@ rpcrdma_inline_fixup(struct rpc_rqst *rqst, char *srcp, int copy_len, int pad)
 			kunmap_atomic(destp);
 			srcp += curlen;
 			copy_len -= curlen;
-			if (copy_len == 0)
+			pagelist_len -= curlen;
+			if (!pagelist_len)
 				break;
 			page_base = 0;
 		}