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ARM fixes for 6.0

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Just one fix for now for the AMBA bus code from Isaac Manjarres.
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Merge tag 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm

Pull ARM fix from Russell King:
 "Just one fix for now for the AMBA bus code from Isaac Manjarres"

* tag 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm:
  ARM: 9229/1: amba: Fix use-after-free in amba_read_periphid()
This commit is contained in:
Linus Torvalds 2022-09-06 21:27:05 -04:00
commit 19f516ea34
2 changed files with 8 additions and 1 deletions
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8
drivers/amba/bus.c
View File

@ -209,6 +209,7 @@ static int amba_match(struct device *dev, struct device_driver *drv)
struct amba_device *pcdev = to_amba_device(dev);
struct amba_driver *pcdrv = to_amba_driver(drv);
mutex_lock(&pcdev->periphid_lock);
if (!pcdev->periphid) {
int ret = amba_read_periphid(pcdev);
@ -218,11 +219,14 @@ static int amba_match(struct device *dev, struct device_driver *drv)
* permanent failure in reading pid and cid, simply map it to
* -EPROBE_DEFER.
*/
if (ret)
if (ret) {
mutex_unlock(&pcdev->periphid_lock);
return -EPROBE_DEFER;
}
dev_set_uevent_suppress(dev, false);
kobject_uevent(&dev->kobj, KOBJ_ADD);
}
mutex_unlock(&pcdev->periphid_lock);
/* When driver_override is set, only bind to the matching driver */
if (pcdev->driver_override)
@ -532,6 +536,7 @@ static void amba_device_release(struct device *dev)
if (d->res.parent)
release_resource(&d->res);
mutex_destroy(&d->periphid_lock);
kfree(d);
}
@ -584,6 +589,7 @@ static void amba_device_initialize(struct amba_device *dev, const char *name)
dev->dev.dma_mask = &dev->dev.coherent_dma_mask;
dev->dev.dma_parms = &dev->dma_parms;
dev->res.name = dev_name(&dev->dev);
mutex_init(&dev->periphid_lock);
}
/**

1
include/linux/amba/bus.h
View File

@ -67,6 +67,7 @@ struct amba_device {
struct clk *pclk;
struct device_dma_parameters dma_parms;
unsigned int periphid;
struct mutex periphid_lock;
unsigned int cid;
struct amba_cs_uci_id uci;
unsigned int irq[AMBA_NR_IRQS];