[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-Id: <20230821073727.225341-1-suhui@nfschina.com>
Date: Mon, 21 Aug 2023 15:37:28 +0800
From: Su Hui <suhui@...china.com>
To: alexander.deucher@....com, christian.koenig@....com,
Xinhui.Pan@....com, airlied@...il.com, daniel@...ll.ch
Cc: Hawking.Zhang@....com, le.ma@....com, lijo.lazar@....com,
yifan1.zhang@....com, candice.li@....com, guchun.chen@....com,
Yuliang.Shi@....com, amd-gfx@...ts.freedesktop.org,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
kernel-janitors@...r.kernel.org, christophe.jaillet@...adoo.fr,
Su Hui <suhui@...china.com>
Subject: [PATCH v2] drm/amdgpu: Avoid possible buffer overflow
smatch error:
drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c:1257 amdgpu_discovery_reg_base_init() error:
testing array offset 'adev->vcn.num_vcn_inst' after use.
change the assignment order to avoid buffer overflow.
Fixes: c40bdfb2ffa4 ("drm/amdgpu: fix incorrect VCN revision in SRIOV")
Signed-off-by: Su Hui <suhui@...china.com>
---
changes in v2:
- fix the error about ip->revision (thanks to Christophe JAILLET).
drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c
index 8e1cfc87122d..b07bfd106a9b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c
@@ -1250,11 +1250,10 @@ static int amdgpu_discovery_reg_base_init(struct amdgpu_device *adev)
* 0b10 : encode is disabled
* 0b01 : decode is disabled
*/
- adev->vcn.vcn_config[adev->vcn.num_vcn_inst] =
- ip->revision & 0xc0;
- ip->revision &= ~0xc0;
if (adev->vcn.num_vcn_inst <
AMDGPU_MAX_VCN_INSTANCES) {
+ adev->vcn.vcn_config[adev->vcn.num_vcn_inst] =
+ ip->revision & 0xc0;
adev->vcn.num_vcn_inst++;
adev->vcn.inst_mask |=
(1U << ip->instance_number);
@@ -1265,6 +1264,7 @@ static int amdgpu_discovery_reg_base_init(struct amdgpu_device *adev)
adev->vcn.num_vcn_inst + 1,
AMDGPU_MAX_VCN_INSTANCES);
}
+ ip->revision &= ~0xc0;
}
if (le16_to_cpu(ip->hw_id) == SDMA0_HWID ||
le16_to_cpu(ip->hw_id) == SDMA1_HWID ||
--
2.30.2
Powered by blists - more mailing lists