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[Qemu-devel] [PATCH] qcow2: Fix potential qemu-img check crash on 32 bit


From: Kevin Wolf
Subject: [Qemu-devel] [PATCH] qcow2: Fix potential qemu-img check crash on 32 bit hosts
Date: Tue, 1 Dec 2015 15:23:45 +0100

This crash was caught with qemu-iotests test case 138.

Commit b6d36de already fixed a few 32 bit truncation bugs that could
cause qemu-img check to allocate too little memory and consequently
it would segfault. On 32 bit hosts, there is one more place that needs
to be fixed because size_t was involved in the calculation and is a
32 bit type there.

Cc: address@hidden
Reported-by: Michael S. Tsirkin <address@hidden>
Signed-off-by: Kevin Wolf <address@hidden>
---
 block/qcow2-refcount.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/qcow2-refcount.c b/block/qcow2-refcount.c
index 6e0e5bd..820f412 100644
--- a/block/qcow2-refcount.c
+++ b/block/qcow2-refcount.c
@@ -1244,7 +1244,7 @@ fail:
 /* refcount checking functions */
 
 
-static size_t refcount_array_byte_size(BDRVQcow2State *s, uint64_t entries)
+static uint64_t refcount_array_byte_size(BDRVQcow2State *s, uint64_t entries)
 {
     /* This assertion holds because there is no way we can address more than
      * 2^(64 - 9) clusters at once (with cluster size 512 = 2^9, and because
-- 
1.8.3.1




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