Commit de36e16d authored Feb 15, 2019 by Chengguang Xu Committed by Greg Kroah-Hartman Apr 02, 2019

chardev: add additional check for minor range overlap



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>

parent 9a41691e

fs/char_dev.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -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;

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