From ce1fed11d18e163baf7f875152a33bf80f625c1a Mon Sep 17 00:00:00 2001 From: Runyu Xiao Date: Wed, 17 Jun 2026 22:53:50 +0800 Subject: [PATCH] misc: nsm: only unlock nsm_dev on post-lock error paths nsm_dev_ioctl() jumps to the common out label even when the initial copy_from_user() fails before nsm->lock has been taken. The error path then blindly unlocks a mutex that was never acquired. This issue was found by our static analysis tool and then manually reviewed against the current tree. The grounded PoC kept the miscdevice ioctl entry and the pre-lock copy_from_user(&raw, argp, _IOC_SIZE(cmd)) failure path by issuing NSM_IOCTL_RAW with an invalid user pointer. That failure reaches the shared out label before mutex_lock(&nsm->lock). Lockdep reported: WARNING: bad unlock balance detected! exploit/193 is trying to release lock (&global_nsm.lock) at: nsm_dev_ioctl+0x5f/0xcf [vuln_msv] but there are no more locks to release! no locks held by exploit/193. Return immediately on the pre-lock copy_from_user() failure and keep the common unlock label for the post-lock paths only. Fixes: b9873755a6c8 ("misc: Add Nitro Secure Module driver") Cc: stable Signed-off-by: Runyu Xiao Reviewed-by: Alexander Graf Link: https://patch.msgid.link/20260617145350.513875-1-runyu.xiao@seu.edu.cn Signed-off-by: Greg Kroah-Hartman --- drivers/misc/nsm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/misc/nsm.c b/drivers/misc/nsm.c index ef7b32742340..185900cdad4a 100644 --- a/drivers/misc/nsm.c +++ b/drivers/misc/nsm.c @@ -367,7 +367,7 @@ static long nsm_dev_ioctl(struct file *file, unsigned int cmd, /* Copy user argument struct to kernel argument struct */ r = -EFAULT; if (copy_from_user(&raw, argp, _IOC_SIZE(cmd))) - goto out; + return r; mutex_lock(&nsm->lock);