File CVE-2013-4539-qemut-tsc210x-fix-buffer-overrun-... of Package xen

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File CVE-2013-4539-qemut-tsc210x-fix-buffer-overrun-on-invalid-state-load.patch of Package xen (Revision 6bbfc10fa0cd4906a4b565a5ad40b57f)

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Subject: tsc210x: fix buffer overrun on invalid state load
From: Michael S. Tsirkin mst@redhat.com Thu Apr 3 19:52:09 2014 +0300
Date: Mon May 5 22:15:02 2014 +0200:
Git: 5193be3be35f29a35bc465036cd64ad60d43385f

CVE-2013-4539

s->precision, nextprecision, function and nextfunction
come from wire and are used
as idx into resolution[] in TSC_CUT_RESOLUTION.

Validate after load to avoid buffer overrun.

Cc: Andreas Färber <afaerber@suse.de>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>

Index: xen-4.6.0-testing/tools/qemu-xen-traditional-dir-remote/hw/tsc210x.c
===================================================================
--- xen-4.6.0-testing.orig/tools/qemu-xen-traditional-dir-remote/hw/tsc210x.c
+++ xen-4.6.0-testing/tools/qemu-xen-traditional-dir-remote/hw/tsc210x.c
@@ -1077,9 +1077,21 @@ static int tsc210x_load(QEMUFile *f, voi
     s->enabled = qemu_get_byte(f);
     s->host_mode = qemu_get_byte(f);
     s->function = qemu_get_byte(f);
+    if (s->function < 0 || s->function >= ARRAY_SIZE(mode_regs)) {
+        return -EINVAL;
+    }
     s->nextfunction = qemu_get_byte(f);
+    if (s->nextfunction < 0 || s->nextfunction >= ARRAY_SIZE(mode_regs)) {
+        return -EINVAL;
+    }
     s->precision = qemu_get_byte(f);
+    if (s->precision < 0 || s->precision >= ARRAY_SIZE(resolution)) {
+        return -EINVAL;
+    }
     s->nextprecision = qemu_get_byte(f);
+    if (s->nextprecision < 0 || s->nextprecision >= ARRAY_SIZE(resolution)) {
+        return -EINVAL;
+    }
     s->filter = qemu_get_byte(f);
     s->pin_func = qemu_get_byte(f);
     s->ref = qemu_get_byte(f);

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File CVE-2013-4539-qemut-tsc210x-fix-buffer-overrun-on-invalid-state-load.patch of Package xen (Revision 6bbfc10fa0cd4906a4b565a5ad40b57f)

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