[PATCH 5.15 090/123] net: mvneta: Prevent out of bounds read in mvneta_config_rss()

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From: Dan Carpenter <error27@xxxxxxxxx>

[ 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: cad5d847a093 ("net: mvneta: Fix the CPU choice in mvneta_percpu_elect")
Signed-off-by: Dan Carpenter <error27@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/net/ethernet/marvell/mvneta.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
index 9d460a270601..a3a5aa8c9656 100644
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -4793,6 +4793,9 @@ 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 */
-- 
2.35.1






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