From b5b97cab55eb71daba3283c8b1d2cce456d511a1 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@amd.com>
Date: Tue, 25 Aug 2020 11:43:45 -0400
Subject: [PATCH] drm/amdgpu: Fix buffer overflow in INFO ioctl
Git-commit: b5b97cab55eb71daba3283c8b1d2cce456d511a1
Patch-mainline: v5.9-rc3
References: git-fixes
The values for "se_num" and "sh_num" come from the user in the ioctl.
They can be in the 0-255 range but if they're more than
AMDGPU_GFX_MAX_SE (4) or AMDGPU_GFX_MAX_SH_PER_SE (2) then it results in
an out of bounds read.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
index 0047da06041f..a1706b9f6467 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
@@ -678,8 +678,12 @@ static int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file
* in the bitfields */
if (se_num == AMDGPU_INFO_MMR_SE_INDEX_MASK)
se_num = 0xffffffff;
+ else if (se_num >= AMDGPU_GFX_MAX_SE)
+ return -EINVAL;
if (sh_num == AMDGPU_INFO_MMR_SH_INDEX_MASK)
sh_num = 0xffffffff;
+ else if (sh_num >= AMDGPU_GFX_MAX_SH_PER_SE)
+ return -EINVAL;
if (info->read_mmr_reg.count > 128)
return -EINVAL;
--
2.16.4