[dpdk-stable] [PATCH v2] lpm: fix buffer overflow

[Bruce Richardson]

On Thu, Oct 21, 2021 at 06:15:49PM +0100, Vladimir Medvedkin wrote:
> This patch fixes buffer overflow reported by ASAN,
> please reference https://bugs.dpdk.org/show_bug.cgi?id=819
> 
> The rte_lpm6 keeps routing information for control plane purpose
> inside the rte_hash table which uses rte_jhash() as a hash function.
> From the rte_jhash() documentation: If input key is not aligned to
> four byte boundaries or a multiple of four bytes in length,
> the memory region just after may be read (but not used in the
> computation).
> rte_lpm6 uses 17 bytes keys consisting of IPv6 address (16 bytes) +
> depth (1 byte).
> 
> This patch increases the size of the depth field up to uint32_t
> and sets the alignment to 4 bytes.
> 
> Bugzilla ID: 819
> Fixes: 86b3b21952a8 ("lpm6: store rules in hash table")
> Cc: alex at therouter.net
> Cc: stable at dpdk.org
> 
> Signed-off-by: Vladimir Medvedkin <vladimir.medvedkin at intel.com>

Acked-by: Bruce Richardson <bruce.richardson at intel.com>