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drm/amdgpu: Check for valid number of registers to read

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Do not try to allocate any amount of memory requested by the user.
Instead limit it to 128 registers. Actually the longest series of
consecutive allowed registers are 48, mmGB_TILE_MODE0-31 and
mmGB_MACROTILE_MODE0-15 (0x2644-0x2673).

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=111273
Signed-off-by: Trek <trek00@inbox.ru>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Trek 2019-08-31 21:25:36 +02:00 committed by Alex Deucher
parent 80f349ce55
commit 13238d4fa6
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
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@ -683,6 +683,9 @@ static int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file
if (sh_num == AMDGPU_INFO_MMR_SH_INDEX_MASK)
sh_num = 0xffffffff;
if (info->read_mmr_reg.count > 128)
return -EINVAL;
regs = kmalloc_array(info->read_mmr_reg.count, sizeof(*regs), GFP_KERNEL);
if (!regs)
return -ENOMEM;