IB/qib: Clear eager buffer memory for each new process

The eager buffers are not being cleared before being mmapped into a
new user address space.  This is a potential security risk and should
be fixed.  Note that the eager header queue is already being cleared.

Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/qib/qib_init.c b/drivers/infiniband/hw/qib/qib_init.c
index 25895991dc52..1d4db4b19d76 100644
--- a/drivers/infiniband/hw/qib/qib_init.c
+++ b/drivers/infiniband/hw/qib/qib_init.c
@@ -1472,6 +1472,9 @@ int qib_setup_eagerbufs(struct qib_ctxtdata *rcd)
                 dma_addr_t pa = rcd->rcvegrbuf_phys[chunk];
                 unsigned i;
 
+                /* clear for security and sanity on each use */
+                memset(rcd->rcvegrbuf[chunk], 0, size);
+
                 for (i = 0; e < egrcnt && i < egrperchunk; e++, i++) {
                         dd->f_put_tid(dd, e + egroff +
                                           (u64 __iomem *)