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| author |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-04-26 10:29:57 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-04-26 10:29:57 +0200 |
| commit | 2891d4feae7c2cf0a56d84bf38519aae6c5060b5 (patch) | |
| tree | bbaea1169908351fd37db46222d30307fae69ec2 /drivers/amba | |
| parent | ARM: amba: Don't read past the end of sysfs "driver_override" buffer (diff) | |
| download | linux-dev-2891d4feae7c2cf0a56d84bf38519aae6c5060b5.tar.xz linux-dev-2891d4feae7c2cf0a56d84bf38519aae6c5060b5.zip | |
Revert "ARM: amba: Fix race condition with driver_override"
This reverts commit 6b614a87f3f477571e319281e84dba11e0ea0a76.
My backport was incorrect, as Geert pointed out :(
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Todd Kjos <tkjos@google.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/amba')
| -rw-r--r-- | drivers/amba/bus.c | 11 |
1 files changed, 2 insertions, 9 deletions
diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c index 8e6ac3031662..fac8e36de11e 100644 --- a/drivers/amba/bus.c +++ b/drivers/amba/bus.c @@ -69,15 +69,11 @@ static ssize_t driver_override_show(struct device *_dev, struct device_attribute *attr, char *buf) { struct amba_device *dev = to_amba_device(_dev); - ssize_t len; if (!dev->driver_override) return 0; - device_lock(_dev); - len = sprintf(buf, "%s\n", dev->driver_override); - device_unlock(_dev); - return len; + return sprintf(buf, "%s\n", dev->driver_override); } static ssize_t driver_override_store(struct device *_dev, @@ -85,7 +81,7 @@ static ssize_t driver_override_store(struct device *_dev, const char *buf, size_t count) { struct amba_device *dev = to_amba_device(_dev); - char *driver_override, *old, *cp; + char *driver_override, *old = dev->driver_override, *cp; /* We need to keep extra room for a newline */ if (count >= (PAGE_SIZE - 1)) @@ -99,15 +95,12 @@ static ssize_t driver_override_store(struct device *_dev, if (cp) *cp = '\0'; - device_lock(_dev); - old = dev->driver_override; if (strlen(driver_override)) { dev->driver_override = driver_override; } else { kfree(driver_override); dev->driver_override = NULL; } - device_unlock(_dev); kfree(old); |