IB/ipath: Fix possible data corruption if multiple SGEs used for receive

The code to copy data from the receive queue buffers to the IB SGEs
doesn't check the SGE length, only the memory region/page length when
copying data.  This could overwrite parts of the user's memory that
were not intended to be written.  It can only happen if multiple SGEs
are used to describe a receive buffer which almost never happens in
practice.

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

diff --git a/drivers/infiniband/hw/ipath/ipath_ruc.c b/drivers/infiniband/hw/ipath/ipath_ruc.c
index 8371186..1b0e62b 100644 (file)
--- a/drivers/infiniband/hw/ipath/ipath_ruc.c
+++ b/drivers/infiniband/hw/ipath/ipath_ruc.c
@@ -396,6 +396,8 @@ again:
 
                if (len > sge->length)
                        len = sge->length;
+               if (len > sge->sge_length)
+                       len = sge->sge_length;
                BUG_ON(len == 0);
                ipath_copy_sge(&qp->r_sge, sge->vaddr, len);
                sge->vaddr += len;

diff --git a/drivers/infiniband/hw/ipath/ipath_ud.c b/drivers/infiniband/hw/ipath/ipath_ud.c
index a518f7c..0b5a6ac 100644 (file)
--- a/drivers/infiniband/hw/ipath/ipath_ud.c
+++ b/drivers/infiniband/hw/ipath/ipath_ud.c
@@ -231,6 +231,8 @@ static void ipath_ud_loopback(struct ipath_qp *sqp,
 
                if (len > length)
                        len = length;
+               if (len > sge->sge_length)
+                       len = sge->sge_length;
                BUG_ON(len == 0);
                ipath_copy_sge(&rsge, sge->vaddr, len);
                sge->vaddr += len;

diff --git a/drivers/infiniband/hw/ipath/ipath_verbs.c b/drivers/infiniband/hw/ipath/ipath_verbs.c
index cd79a8c..35241b7 100644 (file)
--- a/drivers/infiniband/hw/ipath/ipath_verbs.c
+++ b/drivers/infiniband/hw/ipath/ipath_verbs.c
@@ -164,9 +164,11 @@ void ipath_copy_sge(struct ipath_sge_state *ss, void *data, u32 length)
        while (length) {
                u32 len = sge->length;
 
-               BUG_ON(len == 0);
                if (len > length)
                        len = length;
+               if (len > sge->sge_length)
+                       len = sge->sge_length;
+               BUG_ON(len == 0);
                memcpy(sge->vaddr, data, len);
                sge->vaddr += len;
                sge->length -= len;
@@ -202,9 +204,11 @@ void ipath_skip_sge(struct ipath_sge_state *ss, u32 length)
        while (length) {
                u32 len = sge->length;
 
-               BUG_ON(len == 0);
                if (len > length)
                        len = length;
+               if (len > sge->sge_length)
+                       len = sge->sge_length;
+               BUG_ON(len == 0);
                sge->vaddr += len;
                sge->length -= len;
                sge->sge_length -= len;