gnu: qemu: Add fixes for CVE-2015-8619, CVE-2016-1981, CVE-2016-2197.

* gnu/packages/patches/qemu-CVE-2015-8619.patch,
  gnu/packages/patches/qemu-CVE-2016-1981.patch,
  gnu/packages/patches/qemu-CVE-2016-2197.patch,
  gnu/packages/patches/qemu-usb-ehci-oob-read.patch: New files.
* gnu-system.am (dist_patch_DATA): Add them.
* gnu/packages/qemu.scm (qemu)[source]: Add patches.

1 files changed, 40 insertions, 0 deletions

diff --git a/gnu/packages/patches/qemu-CVE-2016-2197.patch b/gnu/packages/patches/qemu-CVE-2016-2197.patch
new file mode 100644
index 0000000000..d851e1ec75
--- /dev/null
+++ b/gnu/packages/patches/qemu-CVE-2016-2197.patch
@@ -0,0 +1,40 @@
+From: John Snow <[email protected]>
+Date: Wed, 10 Feb 2016 13:29:40 -0500
+Subject: [PATCH] ahci: Do not unmap NULL addresses
+
+Definitely don't try to unmap a garbage address.
+
+Reported-by: Zuozhi fzz <[email protected]>
+Signed-off-by: John Snow <[email protected]>
+Message-id: [email protected]
+(cherry picked from commit 99b4cb71069f109b79b27bc629fc0cf0886dbc4b)
+---
+ hw/ide/ahci.c | 8 ++++++++
+ 1 file changed, 8 insertions(+)
+
+diff --git a/hw/ide/ahci.c b/hw/ide/ahci.c
+index 17f1cbd..cdc9299 100644
+--- a/hw/ide/ahci.c
++++ b/hw/ide/ahci.c
+@@ -661,6 +661,10 @@ 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;
+@@ -677,6 +681,10 @@ 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;