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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_UNCONFIRMED "
title="UNCONFIRMED - rte_raw_cksum_mbuf obtain incorrect cksum when a packet in mbuf split mode."
href="https://bugs.dpdk.org/show_bug.cgi?id=1761">1761</a>
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<th>Summary</th>
<td>rte_raw_cksum_mbuf obtain incorrect cksum when a packet in mbuf split mode.
</td>
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<th>Product</th>
<td>DPDK
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>UNCONFIRMED
</td>
</tr>
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<th>Severity</th>
<td>critical
</td>
</tr>
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<th>Priority</th>
<td>Normal
</td>
</tr>
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<th>Component</th>
<td>core
</td>
</tr>
<tr>
<th>Assignee</th>
<td>dev@dpdk.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>yanglanping@bytedance.com
</td>
</tr>
<tr>
<th>Target Milestone</th>
<td>---
</td>
</tr></table>
<p>
<div class="bz_comment_block">
<pre class="bz_comment_text">Hi.
This issue is about calc cksum, in rte_raw_cksum_mbuf function, when the packet
data is stored in multiple mbufs, below code easy overflow.
File rte_cksum.h
line 159: if (done & 1)
line 160: tmp = rte_bswap16((uint16_t)tmp);
line 161: sum += tmp;
The tmp(uint32_t) variable can easily be greater than 0xFFFF, so (uint16_t)tmp
will discard the high 16bit, cause incorrect result.
</pre>
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