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net: sparx5: switchdev: fix possible NULL pointer dereference

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As the possible failure of the allocation, devm_kzalloc() may return NULL
pointer.
Therefore, it should be better to check the 'db' in order to prevent
the dereference of NULL pointer.

Fixes: 10615907e9 ("net: sparx5: switchdev: adding frame DMA functionality")
Signed-off-by: Zheng Yongjun <zhengyongjun3@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Zheng Yongjun 2022-03-26 08:12:39 +00:00 committed by David S. Miller
parent 7781607938
commit 0906f3a3df
1 changed files with 2 additions and 0 deletions
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2
drivers/net/ethernet/microchip/sparx5/sparx5_fdma.c
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@ -422,6 +422,8 @@ static int sparx5_fdma_tx_alloc(struct sparx5 *sparx5)
db_hw->dataptr = phys;
db_hw->status = 0;
db = devm_kzalloc(sparx5->dev, sizeof(*db), GFP_KERNEL);
if (!db)
return -ENOMEM;
db->cpu_addr = cpu_addr;
list_add_tail(&db->list, &tx->db_list);
}