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Message-ID: <20201009135430.GA31347@embeddedor> Date: Fri, 9 Oct 2020 08:54:30 -0500 From: "Gustavo A. R. Silva" <gustavoars@...nel.org> To: Christian König <christian.koenig@....com> Cc: Alex Deucher <alexander.deucher@....com>, David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>, amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org Subject: Re: [PATCH][next] amd/amdgpu_ctx: Use struct_size() helper and kmalloc() On Fri, Oct 09, 2020 at 09:08:51AM +0200, Christian König wrote: > Am 08.10.20 um 16:34 schrieb Gustavo A. R. Silva: > > Make use of the new struct_size() helper instead of the offsetof() idiom. > > Also, use kmalloc() instead of kcalloc(). > > > > Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org> > > --- > > drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c > > index c80d8339f58c..5be125f3b92a 100644 > > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c > > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c > > @@ -100,7 +100,7 @@ static int amdgpu_ctx_init_entity(struct amdgpu_ctx *ctx, u32 hw_ip, > > enum drm_sched_priority priority; > > int r; > > - entity = kcalloc(1, offsetof(typeof(*entity), fences[amdgpu_sched_jobs]), > > + entity = kmalloc(struct_size(entity, fences, amdgpu_sched_jobs), > > NAK. You could use kzalloc() here, but kmalloc won't zero initialize the > memory which could result in unforeseen consequences. Oh I see.. I certainly didn't take that into account. I'll fix that up and respin. Thanks -- Gustavo
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