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chardev: add additional check for minor range overlap
[ Upstream commit de36e16d15
]
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>
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1 changed files with 6 additions and 0 deletions
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@ -159,6 +159,12 @@ __register_chrdev_region(unsigned int major, unsigned int baseminor,
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ret = -EBUSY;
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goto out;
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}
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if (new_min < old_min && new_max > old_max) {
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ret = -EBUSY;
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goto out;
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}
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}
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cd->next = *cp;
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