This is a note to let you know that I've just added the patch titled fsi: Aspeed: Fix a potential double free to the 5.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: fsi-aspeed-fix-a-potential-double-free.patch and it can be found in the queue-5.15 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit dac1b9e3b1fb0ed25ef33c4076b0eb58d23b4586 Author: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx> Date: Sun Jan 9 22:56:10 2022 +0100 fsi: Aspeed: Fix a potential double free [ 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@xxxxxxxxxxxxxxxxxxx> Suggested-by: Guenter Roeck <linux@xxxxxxxxxxxx> Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx> Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx> Link: https://lore.kernel.org/r/2c123f8b0a40dc1a061fae982169fe030b4f47e6.1641765339.git.christophe.jaillet@xxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/fsi/fsi-master-aspeed.c b/drivers/fsi/fsi-master-aspeed.c index 8606e55c1721..0bed2fab8055 100644 --- a/drivers/fsi/fsi-master-aspeed.c +++ b/drivers/fsi/fsi-master-aspeed.c @@ -542,25 +542,28 @@ 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); @@ -595,7 +598,7 @@ 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); @@ -634,6 +637,8 @@ static int fsi_master_aspeed_probe(struct platform_device *pdev) err_release: clk_disable_unprepare(aspeed->clk); +err_free_aspeed: + kfree(aspeed); return rc; }