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From 339f13dfd338d88192a11231f4a60bec57b3b66b Mon Sep 17 00:00:00 2001
From: Kevin Wolf <kwolf@redhat.com>
Date: Tue, 25 Mar 2014 14:23:38 +0100
Subject: [PATCH 31/49] qcow2: Protect against some integer overflows in bdrv_check

RH-Author: Kevin Wolf <kwolf@redhat.com>
Message-id: <1395753835-7591-32-git-send-email-kwolf@redhat.com>
Patchwork-id: n/a
O-Subject: [virt-devel] [EMBARGOED RHEL-7.0 qemu-kvm PATCH 31/48] qcow2: Protect against some integer overflows in bdrv_check
Bugzilla: 1066691
RH-Acked-by: Jeff Cody <jcody@redhat.com>
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1066691
Upstream status: Series embargoed

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 block/qcow2-refcount.c |   18 +++++++++---------
 1 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
index fb57c10..73ae4e3 100644
--- a/block/qcow2-refcount.c
+++ b/block/qcow2-refcount.c
@@ -1018,8 +1018,7 @@ static void inc_refcounts(BlockDriverState *bs,
                           int64_t offset, int64_t size)
 {
     BDRVQcowState *s = bs->opaque;
-    int64_t start, last, cluster_offset;
-    int k;
+    uint64_t start, last, cluster_offset, k;
 
     if (size <= 0)
         return;
@@ -1029,11 +1028,7 @@ static void inc_refcounts(BlockDriverState *bs,
     for(cluster_offset = start; cluster_offset <= last;
         cluster_offset += s->cluster_size) {
         k = cluster_offset >> s->cluster_bits;
-        if (k < 0) {
-            fprintf(stderr, "ERROR: invalid cluster offset=0x%" PRIx64 "\n",
-                cluster_offset);
-            res->corruptions++;
-        } else if (k >= refcount_table_size) {
+        if (k >= refcount_table_size) {
             fprintf(stderr, "Warning: cluster offset=0x%" PRIx64 " is after "
                 "the end of the image file, can't properly check refcounts.\n",
                 cluster_offset);
@@ -1474,14 +1469,19 @@ int qcow2_check_refcounts(BlockDriverState *bs, BdrvCheckResult *res,
                           BdrvCheckMode fix)
 {
     BDRVQcowState *s = bs->opaque;
-    int64_t size, i, highest_cluster;
-    int nb_clusters, refcount1, refcount2;
+    int64_t size, i, highest_cluster, nb_clusters;
+    int refcount1, refcount2;
     QCowSnapshot *sn;
     uint16_t *refcount_table;
     int ret;
 
     size = bdrv_getlength(bs->file);
     nb_clusters = size_to_clusters(s, size);
+    if (nb_clusters > INT_MAX) {
+        res->check_errors++;
+        return -EFBIG;
+    }
+
     refcount_table = g_malloc0(nb_clusters * sizeof(uint16_t));
 
     res->bfi.total_clusters =
-- 
1.7.1