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Re: [Qemu-block] [PATCH] qcow2: Fix potential qemu-img check crash on 32
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-block] [PATCH] qcow2: Fix potential qemu-img check crash on 32 bit hosts |
Date: |
Tue, 1 Dec 2015 16:25:38 +0200 |
On Tue, Dec 01, 2015 at 03:23:45PM +0100, Kevin Wolf wrote:
> 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>
Tested-by: Michael S. Tsirkin <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