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cuse: prevent clone

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[ Upstream commit 8217673d07 ]

For cloned connections cuse_channel_release() will be called more than
once, resulting in use after free.

Prevent device cloning for CUSE, which does not make sense at this point,
and highly unlikely to be used in real life.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Miklos Szeredi 2021-04-14 10:40:58 +02:00 • committed by Greg Kroah-Hartman
commit 2bfc47dec5
1 changed files with 2 additions and 0 deletions
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2
fs/fuse/cuse.c
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@ -627,6 +627,8 @@ static int __init cuse_init(void)
cuse_channel_fops.owner = THIS_MODULE;
cuse_channel_fops.open = cuse_channel_open;
cuse_channel_fops.release = cuse_channel_release;
/* CUSE is not prepared for FUSE_DEV_IOC_CLONE */
cuse_channel_fops.unlocked_ioctl = NULL;
cuse_class = class_create(THIS_MODULE, "cuse");
if (IS_ERR(cuse_class))