sunrpc: potential memory leak in function rdma_read_xdr

In case the check on ch_count fails the cleanup path is skipped and the
previously allocated memory 'rpl_map', 'chl_map' is not freed.

Reported by Coverity.

Signed-off-by: Christian Engelmayer <christian.engelmayer@frequentis.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

diff --git a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
index 42a6f9f..9e88438 100644 (file)
--- a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
@@ -397,14 +397,14 @@ static int rdma_read_xdr(struct svcxprt_rdma *xprt,
        if (!ch)
                return 0;
 
-       /* Allocate temporary reply and chunk maps */
-       rpl_map = svc_rdma_get_req_map();
-       chl_map = svc_rdma_get_req_map();
-
        svc_rdma_rcl_chunk_counts(ch, &ch_count, &byte_count);
        if (ch_count > RPCSVC_MAXPAGES)
                return -EINVAL;
 
+       /* Allocate temporary reply and chunk maps */
+       rpl_map = svc_rdma_get_req_map();
+       chl_map = svc_rdma_get_req_map();
+
        if (!xprt->sc_frmr_pg_list_len)
                sge_count = map_read_chunks(xprt, rqstp, hdr_ctxt, rmsgp,
                                            rpl_map, chl_map, ch_count,