From: Christophe JAILLET christophe.jaillet@wanadoo.fr
[ Upstream commit 83ba7e895debc529803a7a258653f2fe9bf3bf40 ]
A struct device can never be devm_alloc()'ed. Here, it is embedded in "struct fsi_master", and "struct fsi_master" is embedded in "struct fsi_master_aspeed".
Since "struct device" is embedded, the data structure embedding it must be released with the release function, as is already done here.
So use kzalloc() instead of devm_kzalloc() when allocating "aspeed" and update all error handling branches accordingly.
This prevent a potential double free().
This also fix another issue if opb_readl() fails. Instead of a direct return, it now jumps in the error handling path.
Fixes: 606397d67f41 ("fsi: Add ast2600 master driver") Suggested-by: Greg KH gregkh@linuxfoundation.org Suggested-by: Guenter Roeck linux@roeck-us.net Reviewed-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Christophe JAILLET christophe.jaillet@wanadoo.fr Link: https://lore.kernel.org/r/2c123f8b0a40dc1a061fae982169fe030b4f47e6.164176533... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/fsi/fsi-master-aspeed.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-)
diff --git a/drivers/fsi/fsi-master-aspeed.c b/drivers/fsi/fsi-master-aspeed.c index 5d2469d44607..87edc77260d2 100644 --- a/drivers/fsi/fsi-master-aspeed.c +++ b/drivers/fsi/fsi-master-aspeed.c @@ -534,25 +534,28 @@ static int fsi_master_aspeed_probe(struct platform_device *pdev) return rc; }
- aspeed = devm_kzalloc(&pdev->dev, sizeof(*aspeed), GFP_KERNEL); + aspeed = kzalloc(sizeof(*aspeed), GFP_KERNEL); if (!aspeed) return -ENOMEM;
aspeed->dev = &pdev->dev;
aspeed->base = devm_platform_ioremap_resource(pdev, 0); - if (IS_ERR(aspeed->base)) - return PTR_ERR(aspeed->base); + if (IS_ERR(aspeed->base)) { + rc = PTR_ERR(aspeed->base); + goto err_free_aspeed; + }
aspeed->clk = devm_clk_get(aspeed->dev, NULL); if (IS_ERR(aspeed->clk)) { dev_err(aspeed->dev, "couldn't get clock\n"); - return PTR_ERR(aspeed->clk); + rc = PTR_ERR(aspeed->clk); + goto err_free_aspeed; } rc = clk_prepare_enable(aspeed->clk); if (rc) { dev_err(aspeed->dev, "couldn't enable clock\n"); - return rc; + goto err_free_aspeed; }
rc = setup_cfam_reset(aspeed); @@ -587,7 +590,7 @@ static int fsi_master_aspeed_probe(struct platform_device *pdev) rc = opb_readl(aspeed, ctrl_base + FSI_MVER, &raw); if (rc) { dev_err(&pdev->dev, "failed to read hub version\n"); - return rc; + goto err_release; }
reg = be32_to_cpu(raw); @@ -626,6 +629,8 @@ static int fsi_master_aspeed_probe(struct platform_device *pdev)
err_release: clk_disable_unprepare(aspeed->clk); +err_free_aspeed: + kfree(aspeed); return rc; }