linux-kernel - RE: [PATCH] drm/amdgpu: Fix signedness bug in sdma_v4_0_process_trap

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Date: Mon, 29 Apr 2024 01:26:16 +0000
From: "Zhou, Bob" <Bob.Zhou@....com>
To: Dan Carpenter <dan.carpenter@...aro.org>
CC: "Deucher, Alexander" <Alexander.Deucher@....com>, "Koenig, Christian"
	<Christian.Koenig@....com>, "Pan, Xinhui" <Xinhui.Pan@....com>, David Airlie
	<airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, "Kuehling, Felix"
	<Felix.Kuehling@....com>, "Zhang, Hawking" <Hawking.Zhang@....com>, Guchun
 Chen <guchun.chen@....com>, "Ma, Le" <Le.Ma@....com>, "Lazar, Lijo"
	<Lijo.Lazar@....com>, "Sharma, Shashank" <Shashank.Sharma@....com>,
	"amd-gfx@...ts.freedesktop.org" <amd-gfx@...ts.freedesktop.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
Subject: RE: [PATCH] drm/amdgpu: Fix signedness bug in
 sdma_v4_0_process_trap_irq()

[Public]

Reviewed-by: Bob Zhou <bob.zhou@....com>

Regards,
Bob

-----Original Message-----
From: Dan Carpenter <dan.carpenter@...aro.org>
Sent: 2024年4月28日 20:57
To: Zhou, Bob <Bob.Zhou@....com>
Cc: Deucher, Alexander <Alexander.Deucher@....com>; Koenig, Christian <Christian.Koenig@....com>; Pan, Xinhui <Xinhui.Pan@....com>; David Airlie <airlied@...il.com>; Daniel Vetter <daniel@...ll.ch>; Kuehling, Felix <Felix.Kuehling@....com>; Zhang, Hawking <Hawking.Zhang@....com>; Guchun Chen <guchunchen@....com>; Ma, Le <Le.Ma@....com>; Lazar, Lijo <Lijo.Lazar@....com>; Sharma, Shashank <Shashank.Sharma@....com>; amd-gfx@...ts.freedesktop.org; dri-devel@...ts.freedesktop.org; linux-kernel@...r.kernel.org; kernel-janitors@...r.kernel.org
Subject: [PATCH] drm/amdgpu: Fix signedness bug in sdma_v4_0_process_trap_irq()

The "instance" variable needs to be signed for the error handling to work.

Fixes: b34ddc71267a ("drm/amdgpu: add error handle to avoid out-of-bounds")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
 drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c b/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c
index 101038395c3b..772604feb6ac 100644
--- a/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c
@@ -2017,7 +2017,7 @@ static int sdma_v4_0_process_trap_irq(struct amdgpu_device *adev,
                                      struct amdgpu_irq_src *source,
                                      struct amdgpu_iv_entry *entry)  {
-       uint32_t instance;
+       int instance;

        DRM_DEBUG("IH: SDMA trap\n");
        instance = sdma_v4_0_irq_id_to_seq(entry->client_id);
--
2.43.0