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Once misc_register() publishes the device, userspace can > open it and invoke dbc_ioctl() while the mutex is still uninitialized. > > Initialize ioctl_mutex before calling misc_register() so the published > ioctl callback always sees an initialized mutex. > > Fixes: c04cf9e14f10 ("crypto: ccp - Add support for fetching a nonce for dynamic boost control") > Cc: stable@vger.kernel.org > Signed-off-by: Runyu Xiao > Assisted-by: Codex:GPT-5 > --- > drivers/crypto/ccp/dbc.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/crypto/ccp/dbc.c b/drivers/crypto/ccp/dbc.c > index 410084a90..00c864413 100644 > --- a/drivers/crypto/ccp/dbc.c > +++ b/drivers/crypto/ccp/dbc.c > @@ -240,12 +240,12 @@ int dbc_dev_init(struct psp_device *psp) > dbc_dev->char_dev.name = "dbc"; > dbc_dev->char_dev.fops = &dbc_fops; > dbc_dev->char_dev.mode = 0600; > + mutex_init(&dbc_dev->ioctl_mutex); This mixes it in with the misc_register() settings and the call, move it to just before all the settings. Thanks, Tom > + > ret = misc_register(&dbc_dev->char_dev); > if (ret) > goto cleanup_mbox; > > - mutex_init(&dbc_dev->ioctl_mutex); > - > return 0; > > cleanup_mbox: