net: mvneta: Prevent out of bounds read in mvneta_config_rss()

[ Upstream commit e8b4fc13900b8e8be48debffd0dfd391772501f7 ]

The pp->indir[0] value comes from the user.  It is passed to:

	if (cpu_online(pp->rxq_def))

inside the mvneta_percpu_elect() function.  It needs bounds checkeding
to ensure that it is not beyond the end of the cpu bitmap.

Fixes: 4e84c9e82f5d ("net: mvneta: Fix the CPU choice in mvneta_percpu_elect")
Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
index 64aa5510e61a64609fec2a387878278b8454e1ff..67ba697518d6207a0f658f83ac69289a4c89b3df 100644 (file)
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -4235,6 +4235,9 @@ static int  mvneta_config_rss(struct mvneta_port *pp)
                napi_disable(&pp->napi);
        }
 
+       if (pp->indir[0] >= nr_cpu_ids)
+               return -EINVAL;
+
        pp->rxq_def = pp->indir[0];
 
        /* Update unicast mapping */