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SubjectRe: [PATCH 3/4] net: mv643xx_eth: use kzalloc
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On Wed, 2015-09-09 at 10:38 +0200, Rasmus Villemoes wrote:
> The double memset is a little ugly; using kzalloc avoids it altogether.
[]
> diff --git a/drivers/net/ethernet/marvell/mv643xx_eth.c b/drivers/net/ethernet/marvell/mv643xx_eth.c
[]
> @@ -1859,14 +1859,11 @@ oom:
> return;
> }
>
> - mc_spec = kmalloc(0x200, GFP_ATOMIC);
> + mc_spec = kzalloc(0x200, GFP_ATOMIC);
> if (mc_spec == NULL)
> goto oom;
> mc_other = mc_spec + (0x100 >> 2);

This sure looks wrong as it sets a pointer
to unallocated memory.

> - memset(mc_spec, 0, 0x100);
> - memset(mc_other, 0, 0x100);

So this does a memset of random memory.

for (i = 0; i < 0x100; i += 4) {
wrl(mp, SPECIAL_MCAST_TABLE(mp->port_num) + i, mc_spec[i >> 2]);
wrl(mp, OTHER_MCAST_TABLE(mp->port_num) + i, mc_other[i >> 2]);
}




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