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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 > Link: https://lore.kernel.org/all/20260829133410.1708684-1-runyu.xiao@seu.edu.cn/ > Signed-off-by: Runyu Xiao > Assisted-by: Codex:GPT-5 Reviewed-by: Tom Lendacky > --- > v2: > - Move mutex initialization before setting up the misc device, as suggested > by Tom Lendacky. > > 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 410084a9039c..4db49a14550c 100644 > --- a/drivers/crypto/ccp/dbc.c > +++ b/drivers/crypto/ccp/dbc.c > @@ -235,6 +235,8 @@ int dbc_dev_init(struct psp_device *psp) > goto cleanup_mbox; > } > > + mutex_init(&dbc_dev->ioctl_mutex); > + > dbc_dev->char_dev.minor = MISC_DYNAMIC_MINOR; > dbc_dev->char_dev.name = "dbc"; > dbc_dev->char_dev.fops = &dbc_fops; > @@ -243,8 +245,6 @@ int dbc_dev_init(struct psp_device *psp) > if (ret) > goto cleanup_mbox; > > - mutex_init(&dbc_dev->ioctl_mutex); > - > return 0; > > cleanup_mbox: