RDMA/nes: MPA request/response error checking

During Xansation testing, we saw that error handling of MPA frame
msg/response is not handled properly.

Signed-off-by: Faisal Latif <faisal.latif@intel.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 29 insertions, 2 deletions

diff --git a/drivers/infiniband/hw/nes/nes_cm.c b/drivers/infiniband/hw/nes/nes_cm.c
index dbe545505331..ae0946342a9c 100644
--- a/drivers/infiniband/hw/nes/nes_cm.c
+++ b/drivers/infiniband/hw/nes/nes_cm.c
@@ -251,6 +251,33 @@ static int parse_mpa(struct nes_cm_node *cm_node, u8 *buffer, u32 *type,
 
         mpa_frame = (struct ietf_mpa_frame *)buffer;
         cm_node->mpa_frame_size = ntohs(mpa_frame->priv_data_len);
+        /* make sure mpa private data len is less than 512 bytes */
+        if (cm_node->mpa_frame_size > IETF_MAX_PRIV_DATA_LEN) {
+                nes_debug(NES_DBG_CM, "The received Length of Private"
+                        " Data field exceeds 512 octets\n");
+                return -EINVAL;
+        }
+        /*
+         * make sure MPA receiver interoperate with the
+         * received MPA version and MPA key information
+         *
+         */
+        if (mpa_frame->rev != mpa_version) {
+                nes_debug(NES_DBG_CM, "The received mpa version"
+                                " can not be interoperated\n");
+                return -EINVAL;
+        }
+        if (cm_node->state != NES_CM_STATE_MPAREQ_SENT) {
+                if (memcmp(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE)) {
+                        nes_debug(NES_DBG_CM, "Unexpected MPA Key received \n");
+                        return -EINVAL;
+                }
+        } else {
+                if (memcmp(mpa_frame->key, IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE)) {
+                        nes_debug(NES_DBG_CM, "Unexpected MPA Key received \n");
+                        return -EINVAL;
+                }
+        }
 
         if (cm_node->mpa_frame_size + sizeof(struct ietf_mpa_frame) != len) {
                 nes_debug(NES_DBG_CM, "The received ietf buffer was not right"
@@ -1974,7 +2001,7 @@ static struct nes_cm_node *mini_cm_connect(struct nes_cm_core *cm_core,
         if (!cm_node)
                 return NULL;
         mpa_frame = &cm_node->mpa_frame;
-        strcpy(mpa_frame->key, IEFT_MPA_KEY_REQ);
+        memcpy(mpa_frame->key, IEFT_MPA_KEY_REQ, IETF_MPA_KEY_SIZE);
         mpa_frame->flags = IETF_MPA_FLAGS_CRC;
         mpa_frame->rev =  IETF_MPA_VERSION;
         mpa_frame->priv_data_len = htons(private_data_len);
@@ -2929,7 +2956,7 @@ int nes_reject(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len)
         if (cm_node->mpa_frame_size > MAX_CM_BUFFER)
                 return -EINVAL;
 
-        strcpy(&cm_node->mpa_frame.key[0], IEFT_MPA_KEY_REP);
+        memcpy(&cm_node->mpa_frame.key[0], IEFT_MPA_KEY_REP, IETF_MPA_KEY_SIZE);
         if (loopback) {
                 memcpy(&loopback->mpa_frame.priv_data, pdata, pdata_len);
                 loopback->mpa_frame.priv_data_len = pdata_len;