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chardev: add additional check for minor range overlap

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[ Upstream commit de36e16d1557a0b6eb328bc3516359a12ba5c25c ]

Current overlap checking cannot correctly handle
a case which is baseminor < existing baseminor &&
baseminor + minorct > existing baseminor + minorct.

Signed-off-by: Chengguang Xu <cgxu519@gmx.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Chengguang Xu 2019-02-15 20:27:11 +08:00 committed by Greg Kroah-Hartman
parent 06c239a1a0
commit ed3f381e10
1 changed files with 6 additions and 0 deletions
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6
fs/char_dev.c
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@ -159,6 +159,12 @@ __register_chrdev_region(unsigned int major, unsigned int baseminor,
ret = -EBUSY;
goto out;
}
if (new_min < old_min && new_max > old_max) {
ret = -EBUSY;
goto out;
}
}
cd->next = *cp;