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| author |   Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | 2024-07-29 21:51:30 +0900 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2024-07-29 10:44:48 -0700 |
| commit | 99d3bf5f7377d42f8be60a6b9cb60fb0be34dceb (patch) | |
| tree | 78dd9dff2065f2eaf5a9e981f84d56eed2346d10 | |
| parent | Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rmk/linux (diff) | |
| download | wireguard-linux-99d3bf5f7377d42f8be60a6b9cb60fb0be34dceb.tar.xz wireguard-linux-99d3bf5f7377d42f8be60a6b9cb60fb0be34dceb.zip | |
Input: MT - limit max slots
syzbot is reporting too large allocation at input_mt_init_slots(), for
num_slots is supplied from userspace using ioctl(UI_DEV_CREATE).
Since nobody knows possible max slots, this patch chose 1024.
Reported-by: syzbot <syzbot+0122fa359a69694395d5@syzkaller.appspotmail.com>
Closes: https://syzkaller.appspot.com/bug?extid=0122fa359a69694395d5
Suggested-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to '')
| -rw-r--r-- | drivers/input/input-mt.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/input/input-mt.c b/drivers/input/input-mt.c index 14b53dac1253..6b04a674f832 100644 --- a/drivers/input/input-mt.c +++ b/drivers/input/input-mt.c @@ -46,6 +46,9 @@ int input_mt_init_slots(struct input_dev *dev, unsigned int num_slots, return 0; if (mt) return mt->num_slots != num_slots ? -EINVAL : 0; + /* Arbitrary limit for avoiding too large memory allocation. */ + if (num_slots > 1024) + return -EINVAL; mt = kzalloc(struct_size(mt, slots, num_slots), GFP_KERNEL); if (!mt) |