From: Zhang Ming 154842638@qq.com
openEuler inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I3D58V CVE: NA
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No unlock operation is performed on the mpam_devices_lock before the return statement, which may lead to a deadlock.
Signed-off-by: Zhang Ming 154842638@qq.com Reported-by: Cheng Jian cj.chengjian@huawei.com Suggested-by: Cheng Jian cj.chengjian@huawei.com Reviewed-by: Wang ShaoBo bobo.shaobowang@huawei.com Reviewed-by: Xie XiuQi xiexiuqi@huawei.com Signed-off-by: Cheng Jian cj.chengjian@huawei.com Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- arch/arm64/kernel/mpam/mpam_device.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/kernel/mpam/mpam_device.c b/arch/arm64/kernel/mpam/mpam_device.c index fc7aa1ae0b82..f8840274b902 100644 --- a/arch/arm64/kernel/mpam/mpam_device.c +++ b/arch/arm64/kernel/mpam/mpam_device.c @@ -560,8 +560,10 @@ static void __init mpam_enable(struct work_struct *work) mutex_lock(&mpam_devices_lock); mpam_enable_squash_features(); err = mpam_allocate_config(); - if (err) + if (err) { + mutex_unlock(&mpam_devices_lock); return; + } mutex_unlock(&mpam_devices_lock);
mpam_enable_irqs();