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driver core: platform: Don't read past the end of "driver_override" buffer

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When printing the driver_override parameter when it is 4095 and 4094 bytes
long, the printing code would access invalid memory because we need count+1
bytes for printing.

Reject driver_override values of these lengths in driver_override_store().

This is in close analogy to commit 4efe874aac ("PCI: Don't read past the
end of sysfs "driver_override" buffer") from Sasha Levin.

Fixes: 3d713e0e38 ("driver core: platform: add device binding path 'driver_override'")
Cc: stable@vger.kernel.org	# v3.17+
Signed-off-by: Nicolai Stange <nstange@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nicolai Stange 2017-09-11 09:45:42 +02:00 committed by Greg Kroah-Hartman
parent 452562abb5
commit bf563b01c2
1 changed files with 2 additions and 1 deletions
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3
drivers/base/platform.c
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@ -868,7 +868,8 @@ static ssize_t driver_override_store(struct device *dev,
struct platform_device *pdev = to_platform_device(dev);
char *driver_override, *old, *cp;
if (count > PATH_MAX)
/* We need to keep extra room for a newline */
if (count >= (PAGE_SIZE - 1))
return -EINVAL;
driver_override = kstrndup(buf, count, GFP_KERNEL);