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From: Olivier Matz <>
To: Alexander Kozyrev <>
Subject: Re: [dpdk-stable] [PATCH] mbuf: fix external mbufs pool boundaries
Date: Mon, 8 Jun 2020 09:50:11 +0200
Message-ID: <20200608075011.GN12564@platinum> (raw)
In-Reply-To: <>

On Mon, Jun 01, 2020 at 03:24:16PM +0000, Alexander Kozyrev wrote:
> Memzones are created in testpmd in order to test external data
> buffers functionality. Each memzone is 2Mb in size and divided among
> the pool of external memory buffers.
> Memzone may not always be fully utilized because mbufs size can vary
> and some space can be left unused at the tail of a memzone. This is
> not handled properly and mbuf can get the address of this leftover
> space since this address is still valid (part of memzone), but there
> is not enough space to fit the whole packet data. As a result packet
> data may overflow and cause the memory corruption.
> Take mbuf size into account when distributing memory addresses from
> a memzone to external mbufs. Skip the remaining tail in case there
> is not enough room for a packet and move to a next memzone instead.
> Fixes: 6c8e50c2e5 ("mbuf: create pool with external memory buffers")
> Cc:
> Signed-off-by: Alexander Kozyrev <>
> Acked-by: Viacheslav Ovsiienko <>

Acked-by: Olivier Matz <>


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Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-01 15:24 Alexander Kozyrev
2020-06-08  7:50 ` Olivier Matz [this message]
2020-06-11  7:27   ` Thomas Monjalon

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