Commit 13238d4f authored by Trek's avatar Trek Committed by Alex Deucher

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

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=111273Signed-off-by: default avatarTrek <trek00@inbox.ru>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 80f349ce
......@@ -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;
......
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