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From 2f82e5c04bc61946df83cd50fe3794b21570e8e1 Mon Sep 17 00:00:00 2001
From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Sat, 8 Jun 2019 12:23:57 +0300
Subject: [PATCH 2088/2940] drm/amdgpu: Fix bounds checking in
amdgpu_ras_is_supported()
The "block" variable can be set by the user through debugfs, so it can
be quite large which leads to shift wrapping here. This means we report
a "block" as supported when it's not, and that leads to array overflows
later on.
This bug is not really a security issue in real life, because debugfs is
generally root only.
Fixes: 36ea1bd2d084 ("drm/amdgpu: add debugfs ctrl node")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h
index c6b34fbd695f..94c652f5265a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.h
@@ -173,6 +173,8 @@ static inline int amdgpu_ras_is_supported(struct amdgpu_device *adev,
{
struct amdgpu_ras *ras = amdgpu_ras_get_context(adev);
+ if (block >= AMDGPU_RAS_BLOCK_COUNT)
+ return 0;
return ras && (ras->supported & (1 << block));
}
--
2.17.1
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