diff mbox

[PULL,08/11] ahci: Do not unmap NULL addresses

Message ID 1455133089-31903-10-git-send-email-jsnow@redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

John Snow Feb. 10, 2016, 7:38 p.m. UTC 
Definitely don't try to unmap a garbage address.

Reported-by: Zuozhi fzz <zuozhi.fzz@alibaba-inc.com>
Signed-off-by: John Snow <jsnow@redhat.com>
Message-id: 1454103689-13042-2-git-send-email-jsnow@redhat.com
---
 hw/ide/ahci.c | 8 ++++++++
 1 file changed, 8 insertions(+)
diff mbox

Patch

diff --git a/hw/ide/ahci.c b/hw/ide/ahci.c
index 7e87b18..3a95dad 100644
--- a/hw/ide/ahci.c
+++ b/hw/ide/ahci.c
@@ -662,6 +662,10 @@  static bool ahci_map_fis_address(AHCIDevice *ad)
 
 static void ahci_unmap_fis_address(AHCIDevice *ad)
 {
+    if (ad->res_fis == NULL) {
+        DPRINTF(ad->port_no, "Attempt to unmap NULL FIS address\n");
+        return;
+    }
     dma_memory_unmap(ad->hba->as, ad->res_fis, 256,
                      DMA_DIRECTION_FROM_DEVICE, 256);
     ad->res_fis = NULL;
@@ -678,6 +682,10 @@  static bool ahci_map_clb_address(AHCIDevice *ad)
 
 static void ahci_unmap_clb_address(AHCIDevice *ad)
 {
+    if (ad->lst == NULL) {
+        DPRINTF(ad->port_no, "Attempt to unmap NULL CLB address\n");
+        return;
+    }
     dma_memory_unmap(ad->hba->as, ad->lst, 1024,
                      DMA_DIRECTION_FROM_DEVICE, 1024);
     ad->lst = NULL;