| Message ID | 20221202012126.246953-1-yiyang13@huawei.com |
|---|---|
| State | New |
| Headers | show |
| Series | [v2] usb: fotg210-udc: fix potential memory leak in fotg210_udc_probe() | expand |
On Fri, Dec 2, 2022 at 2:25 AM Yi Yang <yiyang13@huawei.com> wrote: > In fotg210_udc_probe(), if devm_clk_get() or clk_prepare_enable() > fails, 'fotg210' will not be freed, which will lead to a memory leak. > Fix it by moving kfree() to a proper location. > > In addition，we can use "return -ENOMEM" instead of "goto err" > to simplify the code. > > Fixes: 718a38d092ec ("fotg210-udc: Handle PCLK") > Signed-off-by: Yi Yang <yiyang13@huawei.com> > Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> I have some cleanup patches switching around to devm* handling cooking for v6.3, but let's do this for now. Yours, Linus Walleij
diff --git a/drivers/usb/fotg210/fotg210-udc.c b/drivers/usb/fotg210/fotg210-udc.c index b9ea6c6d931c..66e1b7ee3346 100644 --- a/drivers/usb/fotg210/fotg210-udc.c +++ b/drivers/usb/fotg210/fotg210-udc.c @@ -1163,12 +1163,10 @@ int fotg210_udc_probe(struct platform_device *pdev) return -ENODEV; } - ret = -ENOMEM; - /* initialize udc */ fotg210 = kzalloc(sizeof(struct fotg210_udc), GFP_KERNEL); if (fotg210 == NULL) - goto err; + return -ENOMEM; fotg210->dev = dev; @@ -1178,7 +1176,7 @@ int fotg210_udc_probe(struct platform_device *pdev) ret = clk_prepare_enable(fotg210->pclk); if (ret) { dev_err(dev, "failed to enable PCLK\n"); - return ret; + goto err; } } else if (PTR_ERR(fotg210->pclk) == -EPROBE_DEFER) { /* @@ -1302,8 +1300,7 @@ int fotg210_udc_probe(struct platform_device *pdev) if (!IS_ERR(fotg210->pclk)) clk_disable_unprepare(fotg210->pclk); - kfree(fotg210); - err: + kfree(fotg210); return ret; }
In fotg210_udc_probe(), if devm_clk_get() or clk_prepare_enable() fails, 'fotg210' will not be freed, which will lead to a memory leak. Fix it by moving kfree() to a proper location. In addition，we can use "return -ENOMEM" instead of "goto err" to simplify the code. Fixes: 718a38d092ec ("fotg210-udc: Handle PCLK") Signed-off-by: Yi Yang <yiyang13@huawei.com> Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com> --- v2: -Use "return -ENOMEM" instead of "goto err" drivers/usb/fotg210/fotg210-udc.c | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-)