[PATCH] soc/fsl/qe: fix err handling of ucc_of_parse_tdm
From: Yi Wang <hidden>
Date: 2018-11-22 06:48:37
Also in:
linuxppc-dev, lkml
Subsystem:
freescale quicc engine library, freescale soc drivers, the rest · Maintainers:
Qiang Zhao, Christophe Leroy, Linus Torvalds
From: Wen Yang <redacted> 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 <redacted> Signed-off-by: Wen Yang <redacted> CC: Julia Lawall <redacted> CC: Zhao Qiang <qiang.zhao@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