Commit c106ddc7 authored by Chengguang Xu's avatar Chengguang Xu Committed by Greg Kroah-Hartman

chardev: add additional check for minor range overlap

[ Upstream commit de36e16d ]

Current overlap checking cannot correctly handle
a case which is baseminor < existing baseminor &&
baseminor + minorct > existing baseminor + minorct.
Signed-off-by: default avatarChengguang Xu <cgxu519@gmx.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent b086be4c
...@@ -159,6 +159,12 @@ __register_chrdev_region(unsigned int major, unsigned int baseminor, ...@@ -159,6 +159,12 @@ __register_chrdev_region(unsigned int major, unsigned int baseminor,
ret = -EBUSY; ret = -EBUSY;
goto out; goto out;
} }
if (new_min < old_min && new_max > old_max) {
ret = -EBUSY;
goto out;
}
} }
cd->next = *cp; cd->next = *cp;
......
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