Commit 8d68100a authored by Wen Yang's avatar Wen Yang Committed by David S. Miller
Browse files

soc/fsl/qe: fix err handling of ucc_of_parse_tdm 



Currently there are some issues with the ucc_of_parse_tdm function:
1, a possible null pointer dereference in ucc_of_parse_tdm,
detected by the semantic patch deref_null.cocci,
with the following warning:
drivers/soc/fsl/qe/qe_tdm.c:177:21-24: ERROR: pdev is NULL but dereferenced.
2, dev gets modified, so in any case that devm_iounmap() will fail
even when the new pdev is valid, because the iomap was done with a
 different pdev.
3, there is no driver bind with the "fsl,t1040-qe-si" or
"fsl,t1040-qe-siram" device. So allocating resources using devm_*()
with these devices won't provide a cleanup path for these resources
when the caller fails.

This patch fixes them.

Suggested-by: default avatarLi Yang <leoyang.li@nxp.com>
Suggested-by: default avatarChristophe LEROY <christophe.leroy@c-s.fr>
Signed-off-by: default avatarWen Yang <wen.yang99@zte.com.cn>
Reviewed-by: default avatarPeng Hao <peng.hao2@zte.com.cn>
CC: Julia Lawall <julia.lawall@lip6.fr>
CC: Zhao Qiang <qiang.zhao@nxp.com>
CC: David S. Miller <davem@davemloft.net>
CC: netdev@vger.kernel.org
CC: linuxppc-dev@lists.ozlabs.org
CC: linux-kernel@vger.kernel.org
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 36352991

drivers/net/wan/fsl_ucc_hdlc.c

+61 −1
Original line number Diff line number Diff line
@@ -1057,6 +1057,54 @@ static const struct net_device_ops uhdlc_ops = { 
	.ndo_tx_timeout	= uhdlc_tx_timeout,

};



static int hdlc_map_iomem(char *name, int init_flag, void __iomem **ptr)

{

	struct device_node *np;

	struct platform_device *pdev;

	struct resource *res;

	static int siram_init_flag;

	int ret = 0;



	np = of_find_compatible_node(NULL, NULL, name);

	if (!np)

		return -EINVAL;



	pdev = of_find_device_by_node(np);

	if (!pdev) {

		pr_err("%pOFn: failed to lookup pdev\n", np);

		of_node_put(np);

		return -EINVAL;

	}



	of_node_put(np);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	if (!res) {

		ret = -EINVAL;

		goto error_put_device;

	}

	*ptr = ioremap(res->start, resource_size(res));

	if (!*ptr) {

		ret = -ENOMEM;

		goto error_put_device;

	}



	/* We've remapped the addresses, and we don't need the device any

	 * more, so we should release it.

	 */

	put_device(&pdev->dev);



	if (init_flag && siram_init_flag == 0) {

		memset_io(*ptr, 0, resource_size(res));

		siram_init_flag = 1;

	}

	return  0;



error_put_device:

	put_device(&pdev->dev);



	return ret;

}



static int ucc_hdlc_probe(struct platform_device *pdev)

{

	struct device_node *np = pdev->dev.of_node;
@@ -1151,6 +1199,15 @@ static int ucc_hdlc_probe(struct platform_device *pdev) 
		ret = ucc_of_parse_tdm(np, utdm, ut_info);

		if (ret)

			goto free_utdm;



		ret = hdlc_map_iomem("fsl,t1040-qe-si", 0,

				     (void __iomem **)&utdm->si_regs);

		if (ret)

			goto free_utdm;

		ret = hdlc_map_iomem("fsl,t1040-qe-siram", 1,

				     (void __iomem **)&utdm->siram);

		if (ret)

			goto unmap_si_regs;

	}



	if (of_property_read_u16(np, "fsl,hmask", &uhdlc_priv->hmask))
@@ -1159,7 +1216,7 @@ static int ucc_hdlc_probe(struct platform_device *pdev) 
	ret = uhdlc_init(uhdlc_priv);

	if (ret) {

		dev_err(&pdev->dev, "Failed to init uhdlc\n");

		goto free_utdm;

		goto undo_uhdlc_init;

	}



	dev = alloc_hdlcdev(uhdlc_priv);
@@ -1188,6 +1245,9 @@ static int ucc_hdlc_probe(struct platform_device *pdev) 
free_dev:

	free_netdev(dev);

undo_uhdlc_init:

	iounmap(utdm->siram);

unmap_si_regs:

	iounmap(utdm->si_regs);

free_utdm:

	if (uhdlc_priv->tsa)

		kfree(utdm);

drivers/soc/fsl/qe/qe_tdm.c

+0 −55
Original line number Diff line number Diff line
@@ -44,10 +44,6 @@ int ucc_of_parse_tdm(struct device_node *np, struct ucc_tdm *utdm, 
	const char *sprop;

	int ret = 0;

	u32 val;

	struct resource *res;

	struct device_node *np2;

	static int siram_init_flag;

	struct platform_device *pdev;



	sprop = of_get_property(np, "fsl,rx-sync-clock", NULL);

	if (sprop) {
@@ -124,57 +120,6 @@ int ucc_of_parse_tdm(struct device_node *np, struct ucc_tdm *utdm, 
	utdm->siram_entry_id = val;



	set_si_param(utdm, ut_info);



	np2 = of_find_compatible_node(NULL, NULL, "fsl,t1040-qe-si");

	if (!np2)

		return -EINVAL;



	pdev = of_find_device_by_node(np2);

	if (!pdev) {

		pr_err("%pOFn: failed to lookup pdev\n", np2);

		of_node_put(np2);

		return -EINVAL;

	}



	of_node_put(np2);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	utdm->si_regs = devm_ioremap_resource(&pdev->dev, res);

	if (IS_ERR(utdm->si_regs)) {

		ret = PTR_ERR(utdm->si_regs);

		goto err_miss_siram_property;

	}



	np2 = of_find_compatible_node(NULL, NULL, "fsl,t1040-qe-siram");

	if (!np2) {

		ret = -EINVAL;

		goto err_miss_siram_property;

	}



	pdev = of_find_device_by_node(np2);

	if (!pdev) {

		ret = -EINVAL;

		pr_err("%pOFn: failed to lookup pdev\n", np2);

		of_node_put(np2);

		goto err_miss_siram_property;

	}



	of_node_put(np2);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	utdm->siram = devm_ioremap_resource(&pdev->dev, res);

	if (IS_ERR(utdm->siram)) {

		ret = PTR_ERR(utdm->siram);

		goto err_miss_siram_property;

	}



	if (siram_init_flag == 0) {

		memset_io(utdm->siram, 0,  resource_size(res));

		siram_init_flag = 1;

	}



	return ret;



err_miss_siram_property:

	devm_iounmap(&pdev->dev, utdm->si_regs);

	return ret;

}

EXPORT_SYMBOL(ucc_of_parse_tdm);

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