FreeBSD Bugzilla – Attachment 242085 Details for
Bug 271288
FreeBSD 13.2; Alignment Fault ; virtio-net
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[patch]
testcase: offseting the m_data by constant to avoid unaligned data access
if_vtnet.c.patch (text/plain), 541 bytes, created by
martin
on 2023-05-09 22:01:47 UTC
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Description:
testcase: offseting the m_data by constant to avoid unaligned data access
Filename:
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Creator:
martin
Created:
2023-05-09 22:01:47 UTC
Size:
541 bytes
patch
obsolete
>--- usr/src/sys/dev/virtio/network/if_vtnet.c 2023-05-09 23:46:18.844236000 +0000 >+++ usr/src/sys/dev/virtio/network/if_vtnet.c 2023-05-09 23:48:11.081189000 +0000 >@@ -1541,7 +1541,12 @@ > return (NULL); > } > >- m->m_len = size; >+ #define VTNET_ALIGNMENT_FUDGE 2 >+ m->m_data += VTNET_ALIGNMENT_FUDGE; >+ >+ KASSERT(size + VTNET_ALIGNMENT_FUDGE > 0, ("%s: mbuf size (%d) smaller than VTNET_ALIGNMENT_FUDGE", __func__, size)); >+ m->m_len = size - VTNET_ALIGNMENT_FUDGE; >+ > if (m_head != NULL) { > m_tail->m_next = m; > m_tail = m;
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