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[Qemu-devel] [PATCH 14/15] Fix integer overflow in block migration bandw

From: Kevin Wolf
Subject: [Qemu-devel] [PATCH 14/15] Fix integer overflow in block migration bandwidth calculation
Date: Thu, 7 Apr 2011 16:49:23 +0200

From: Avishay Traeger <address@hidden>

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).  Change order to avoid.

Signed-off-by: Avishay Traeger <address@hidden>
Signed-off-by: Kevin Wolf <address@hidden>
 block-migration.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/block-migration.c b/block-migration.c
index 8218bac..576e55a 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 (block_mig_state.reads / block_mig_state.total_time) * BLOCK_SIZE;
 static int bmds_aio_inflight(BlkMigDevState *bmds, int64_t sector)

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