From: Wen Yang <wen.yan...@zte.com.cn> Currently there are 2 problems 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. This patch fixes them.
Suggested-by: Christophe LEROY <christophe.le...@c-s.fr> Signed-off-by: Wen Yang <wen.yan...@zte.com.cn> CC: Julia Lawall <julia.law...@lip6.fr> CC: Zhao Qiang <qiang.z...@nxp.com> --- drivers/soc/fsl/qe/qe_tdm.c | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) diff --git a/drivers/soc/fsl/qe/qe_tdm.c b/drivers/soc/fsl/qe/qe_tdm.c index f78c346..9a29f0b 100644 --- a/drivers/soc/fsl/qe/qe_tdm.c +++ b/drivers/soc/fsl/qe/qe_tdm.c @@ -47,7 +47,7 @@ int ucc_of_parse_tdm(struct device_node *np, struct ucc_tdm *utdm, struct resource *res; struct device_node *np2; static int siram_init_flag; - struct platform_device *pdev; + struct platform_device *pdev_si, *pdev_siram; sprop = of_get_property(np, "fsl,rx-sync-clock", NULL); if (sprop) { @@ -129,16 +129,16 @@ int ucc_of_parse_tdm(struct device_node *np, struct ucc_tdm *utdm, if (!np2) return -EINVAL; - pdev = of_find_device_by_node(np2); - if (!pdev) { + pdev_si = of_find_device_by_node(np2); + if (!pdev_si) { 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); + res = platform_get_resource(pdev_si, IORESOURCE_MEM, 0); + utdm->si_regs = devm_ioremap_resource(&pdev_si->dev, res); if (IS_ERR(utdm->si_regs)) { ret = PTR_ERR(utdm->si_regs); goto err_miss_siram_property; @@ -150,8 +150,8 @@ int ucc_of_parse_tdm(struct device_node *np, struct ucc_tdm *utdm, goto err_miss_siram_property; } - pdev = of_find_device_by_node(np2); - if (!pdev) { + pdev_siram = of_find_device_by_node(np2); + if (!pdev_siram) { ret = -EINVAL; pr_err("%pOFn: failed to lookup pdev\n", np2); of_node_put(np2); @@ -159,8 +159,8 @@ int ucc_of_parse_tdm(struct device_node *np, struct ucc_tdm *utdm, } of_node_put(np2); - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - utdm->siram = devm_ioremap_resource(&pdev->dev, res); + res = platform_get_resource(pdev_siram, IORESOURCE_MEM, 0); + utdm->siram = devm_ioremap_resource(&pdev_siram->dev, res); if (IS_ERR(utdm->siram)) { ret = PTR_ERR(utdm->siram); goto err_miss_siram_property; @@ -174,7 +174,7 @@ int ucc_of_parse_tdm(struct device_node *np, struct ucc_tdm *utdm, return ret; err_miss_siram_property: - devm_iounmap(&pdev->dev, utdm->si_regs); + devm_iounmap(&pdev_si->dev, utdm->si_regs); return ret; } EXPORT_SYMBOL(ucc_of_parse_tdm); -- 2.9.5