From 80414abc2848f43690c8402a77d37710ad0020c2 Mon Sep 17 00:00:00 2001 From: Chuck Lever Date: Wed, 29 Jun 2016 13:54:33 -0400 Subject: [PATCH] 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 Tested-by: Steve Wise Signed-off-by: Anna Schumaker --- net/sunrpc/xprtrdma/rpc_rdma.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) diff --git a/net/sunrpc/xprtrdma/rpc_rdma.c b/net/sunrpc/xprtrdma/rpc_rdma.c index f60d229b78b4..e3560c2e2271 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; } -- GitLab