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Re: [Qemu-devel] [PATCH] Fix integer overflow in block migration bandwid
From: |
Kevin Wolf |
Subject: |
Re: [Qemu-devel] [PATCH] Fix integer overflow in block migration bandwidth calculation |
Date: |
Tue, 05 Apr 2011 14:54:58 +0200 |
User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.15) Gecko/20101027 Fedora/3.0.10-1.fc12 Thunderbird/3.0.10 |
Am 31.03.2011 15:52, schrieb Avishay Traeger:
>
> block_mig_state.reads is an int, and multiplying by BLOCK_SIZE yielded a
> negative number, resulting in a negative bandwidth (running on a 32-bit
> machine). Cast to avoid.
>
> Signed-off-by: Avishay Traeger <address@hidden>
This patch is corrupted by line wraps.
> ---
> block-migration.c | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/block-migration.c b/block-migration.c
> index 8218bac..ffc92ee 100644
> --- a/block-migration.c
> +++ b/block-migration.c
> @@ -140,7 +140,7 @@ static inline void add_avg_read_time(int64_t time)
> static inline long double compute_read_bwidth(void)
> {
> assert(block_mig_state.total_time != 0);
> - return (block_mig_state.reads * BLOCK_SIZE)/
> block_mig_state.total_time;
> + return ((long long)block_mig_state.reads * BLOCK_SIZE)/
> block_mig_state.total_time;
This line exceeds 80 characters. While you're at it, you could add a
space before the /
Kevin
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