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Re: [lwip-users] http server and pbuf overflow

From: Bernhard 'Gustl' Bauer
Subject: Re: [lwip-users] http server and pbuf overflow
Date: Fri, 22 Jan 2010 10:03:22 +0100
User-agent: Thunderbird (Windows/20090812)

Bill Auerbach schrieb:
Check to be sure your Ethernet driver isn't increasing pbuf->ref anywhere.
Some drivers do this so that the packet is freed only after a DMA transfer
is complete and not at the time low_level_output returns.  If it's freed too
soon the packet can be corrupted if its pbuf is used before the DMA

I only use pbuf_alloc() and pbuf_free(). I never use pbuf_ref(), or access pbuf->ref.

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