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fsl/fman: Check for null pointer after calling devm_ioremap

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[ Upstream commit d5a73ec96cc57cf67e51b12820fc2354e7ca46f8 ]

As the possible failure of the allocation, the devm_ioremap() may return
NULL pointer.
Take tgec_initialization() as an example.
If allocation fails, the params->base_addr will be NULL pointer and will
be assigned to tgec->regs in tgec_config().
Then it will cause the dereference of NULL pointer in set_mac_address(),
which is called by tgec_init().
Therefore, it should be better to add the sanity check after the calling
of the devm_ioremap().

Fixes: 3933961682a3 ("fsl/fman: Add FMan MAC driver")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jiasheng Jiang 2022-01-06 18:04:10 +08:00 committed by Greg Kroah-Hartman
parent f377b3a961
commit 7eb361b0dc
1 changed files with 16 additions and 5 deletions
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21
drivers/net/ethernet/freescale/fman/mac.c
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@ -96,14 +96,17 @@ static void mac_exception(void *handle, enum fman_mac_exceptions ex)
__func__, ex);
}
static void set_fman_mac_params(struct mac_device *mac_dev,
struct fman_mac_params *params)
static int set_fman_mac_params(struct mac_device *mac_dev,
struct fman_mac_params *params)
{
struct mac_priv_s *priv = mac_dev->priv;
params->base_addr = (typeof(params->base_addr))
devm_ioremap(priv->dev, mac_dev->res->start,
resource_size(mac_dev->res));
if (!params->base_addr)
return -ENOMEM;
memcpy(&params->addr, mac_dev->addr, sizeof(mac_dev->addr));
params->max_speed = priv->max_speed;
params->phy_if = priv->phy_if;
@ -114,6 +117,8 @@ static void set_fman_mac_params(struct mac_device *mac_dev,
params->event_cb = mac_exception;
params->dev_id = mac_dev;
params->internal_phy_node = priv->internal_phy_node;
return 0;
}
static int tgec_initialization(struct mac_device *mac_dev)
@ -125,7 +130,9 @@ static int tgec_initialization(struct mac_device *mac_dev)
priv = mac_dev->priv;
set_fman_mac_params(mac_dev, &params);
err = set_fman_mac_params(mac_dev, &params);
if (err)
goto _return;
mac_dev->fman_mac = tgec_config(&params);
if (!mac_dev->fman_mac) {
@ -171,7 +178,9 @@ static int dtsec_initialization(struct mac_device *mac_dev)
priv = mac_dev->priv;
set_fman_mac_params(mac_dev, &params);
err = set_fman_mac_params(mac_dev, &params);
if (err)
goto _return;
mac_dev->fman_mac = dtsec_config(&params);
if (!mac_dev->fman_mac) {
@ -220,7 +229,9 @@ static int memac_initialization(struct mac_device *mac_dev)
priv = mac_dev->priv;
set_fman_mac_params(mac_dev, &params);
err = set_fman_mac_params(mac_dev, &params);
if (err)
goto _return;
if (priv->max_speed == SPEED_10000)
params.phy_if = PHY_INTERFACE_MODE_XGMII;