mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-10-01 22:54:01 +00:00
Code Issues Releases Wiki Activity

chardev: add additional check for minor range overlap

Browse source 
[ 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>
This commit is contained in:
Chengguang Xu 2019-02-15 20:27:11 +08:00 committed by Greg Kroah-Hartman
parent de90525fbe
commit bb22efcb87
1 changed files with 6 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
fs/char_dev.c
View file

@ -134,6 +134,12 @@ __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;