Package: nicstat
Version: 1.92-1
Tags: patch
On Linux, when nicstat obtains nic info via ioctl SIOCETHTOOL, it picks
up the speed from a struct ethtool_cmd, where it's stored as a u16 in
Mbps, and multiplies it by the integer literal 1000000 to get bps.
On 10GbE ethernet this causes a signed integer overflow, which is
undefined behaviour and the result sadly never seems to work out to
the correct 10,000,000,000 bps :-)
diff --git a/nicstat.c b/nicstat.c
index 3b028d7..579501d 100644
--- a/nicstat.c
+++ b/nicstat.c
@@ -1585,7 +1585,7 @@ get_speed_duplex(nicdata_t *nicp)
get_speed_duplex(nicp);
return;
}
- nicp->speed = edata.speed * 1000000;
+ nicp->speed = (uint64_t)edata.speed * 1000000;
nicp->duplex = edata.duplex;
}
#endif /* OS_LINUX */
Thanks,
--
Stelios.
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