From: QintaoShen <unSimple1993@163.com> stable inclusion from stable-v4.19.239 commit 94869bb0de69a812f70231b0eb480bb2f7ae73a6 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IBP16T CVE: CVE-2022-49055 Reference: https://git.kernel.org/stable/c/94869bb0de69a812f70231b0eb480bb2f7ae73a6 -------------------------------- [ Upstream commit ebbb7bb9e80305820dc2328a371c1b35679f2667 ] As the kmalloc_array() may return null, the 'event_waiters[i].wait' would lead to null-pointer dereference. Therefore, it is better to check the return value of kmalloc_array() to avoid this confusion. Signed-off-by: QintaoShen <unSimple1993@163.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Luo Gengkun <luogengkun2@huawei.com> --- drivers/gpu/drm/amd/amdkfd/kfd_events.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_events.c b/drivers/gpu/drm/amd/amdkfd/kfd_events.c index e9f0e0a1b41c..892077377339 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_events.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_events.c @@ -532,6 +532,8 @@ static struct kfd_event_waiter *alloc_event_waiters(uint32_t num_events) event_waiters = kmalloc_array(num_events, sizeof(struct kfd_event_waiter), GFP_KERNEL); + if (!event_waiters) + return NULL; for (i = 0; (event_waiters) && (i < num_events) ; i++) { init_wait(&event_waiters[i].wait); -- 2.34.1