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crypto: ccp - Initialize DBC ioctl mutex before registering device

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dbc_dev_init() registers the DBC misc device before initializing
ioctl_mutex. 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: c04cf9e14f ("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 <runyu.xiao@seu.edu.cn>
Assisted-by: Codex:GPT-5
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Reviewed-by: Mario Limonciello (AMD) <superm1@kernel.org>> ---
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Runyu Xiao 2026-08-30 09:51:04 +08:00 committed by Herbert Xu
parent ba871255f7
commit e9b1d168f2
1 changed files with 2 additions and 2 deletions
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4
drivers/crypto/ccp/dbc.c
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@ -236,6 +236,8 @@ 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;
@ -244,8 +246,6 @@ int dbc_dev_init(struct psp_device *psp)
if (ret)
goto cleanup_mbox;
mutex_init(&dbc_dev->ioctl_mutex);
return 0;
cleanup_mbox: