Subject: [PATCH 23/46] rdma: don't use negative index to array

From: Nigel Croxon <[email-masked]>
Date: Thu, 14 Nov 2013 22:52:59 +0100

RH-Author: Nigel Croxon <[email-masked]>
Message-id: <[email-masked]>
Patchwork-id: 55707
O-Subject: [RHEL7.0 PATCH 23/42] rdma: don't use negative index to array
Bugzilla: 1011720
RH-Acked-by: Orit Wasserman <[email-masked]>
RH-Acked-by: Amit Shah <[email-masked]>
RH-Acked-by: Paolo Bonzini <[email-masked]>

Bugzilla: 1011720
https://bugzilla.redhat.com/show_bug.cgi?id=1011720

>From commit ID:
commit 44b5949491a47043c4f7c4ff09f0191f82919a82
Author: Isaku Yamahata <[email-masked]>
Date:   Sat Aug 3 22:54:51 2013 -0400

    rdma: don't use negative index to array

    Reviewed-by: Michael R. Hines <[email-masked]>
    Signed-off-by: Isaku Yamahata <[email-masked]>
    Signed-off-by: Michael R. Hines <[email-masked]>
    Message-id: [email-masked]
    Signed-off-by: Anthony Liguori <[email-masked]>
---
 migration-rdma.c |   27 +++++++++++++++------------
 1 files changed, 15 insertions(+), 12 deletions(-)

Signed-off-by: Michal Novotny <[email-masked]>
---
 migration-rdma.c | 27 +++++++++++++++------------
 1 file changed, 15 insertions(+), 12 deletions(-)

diff --git a/migration-rdma.c b/migration-rdma.c
index c958e5f..7266803 100644
--- a/migration-rdma.c
+++ b/migration-rdma.c
@@ -1933,10 +1933,21 @@ static int qemu_rdma_write_flush(QEMUFile *f, RDMAContext *rdma)
 static inline int qemu_rdma_buffer_mergable(RDMAContext *rdma,
                     uint64_t offset, uint64_t len)
 {
-    RDMALocalBlock *block =
-        &(rdma->local_ram_blocks.block[rdma->current_index]);
-    uint8_t *host_addr = block->local_host_addr + (offset - block->offset);
-    uint8_t *chunk_end = ram_chunk_end(block, rdma->current_chunk);
+    RDMALocalBlock *block;
+    uint8_t *host_addr;
+    uint8_t *chunk_end;
+
+    if (rdma->current_index < 0) {
+        return 0;
+    }
+
+    if (rdma->current_chunk < 0) {
+        return 0;
+    }
+
+    block = &(rdma->local_ram_blocks.block[rdma->current_index]);
+    host_addr = block->local_host_addr + (offset - block->offset);
+    chunk_end = ram_chunk_end(block, rdma->current_chunk);
 
     if (rdma->current_length == 0) {
         return 0;
@@ -1949,10 +1960,6 @@ static inline int qemu_rdma_buffer_mergable(RDMAContext *rdma,
         return 0;
     }
 
-    if (rdma->current_index < 0) {
-        return 0;
-    }
-
     if (offset < block->offset) {
         return 0;
     }
@@ -1961,10 +1968,6 @@ static inline int qemu_rdma_buffer_mergable(RDMAContext *rdma,
         return 0;
     }
 
-    if (rdma->current_chunk < 0) {
-        return 0;
-    }
-
     if ((host_addr + len) > chunk_end) {
         return 0;
     }
-- 
1.7.11.7