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[lwip-devel] [bug #41188] Alignment error in memp_init() when MEMP_SEPAR
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From: |
Valery Ushakov |
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Subject: |
[lwip-devel] [bug #41188] Alignment error in memp_init() when MEMP_SEPARATE_POOLS==1 |
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Date: |
Thu, 23 Jan 2014 04:32:21 +0000 |
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User-agent: |
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:26.0) Gecko/20100101 Firefox/26.0 |
Follow-up Comment #2, bug #41188 (project lwip):
Actually, don't separate pools need the same MEM_ALIGNMENT-1 padding
at the beginning as memp_memory has to compensate for potential
misalignment?
>From a quick look - consider a trivial case of a pool with 1 element
that is 8 bytes large and with alignment of 8. It's memory base will
be declared of size 8. If the base ends up allocated, say, only
4-aligned, but not 8-aligned, LWIP_MEM_ALIGN will offset 4 bytes into
the array and the returned object will be outside the bounds of the
pool memory.
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