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Date: Mon, 11 Apr 2022 20:52:42 -0400 From: Sasha Levin <sashal@...nel.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: QintaoShen <unSimple1993@....com>, Alex Deucher <alexander.deucher@....com>, Sasha Levin <sashal@...nel.org>, Felix.Kuehling@....com, christian.koenig@....com, Xinhui.Pan@....com, airlied@...ux.ie, daniel@...ll.ch, amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org Subject: [PATCH AUTOSEL 4.9 1/7] drm/amdkfd: Check for potential null return of kmalloc_array() From: QintaoShen <unSimple1993@....com> [ 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@....com> Signed-off-by: Alex Deucher <alexander.deucher@....com> Signed-off-by: Sasha Levin <sashal@...nel.org> --- 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 6a3470f84998..732713ff3190 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_events.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_events.c @@ -607,6 +607,8 @@ 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_LIST_HEAD(&event_waiters[i].waiters); -- 2.35.1
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