Patch "drm/amdgpu: Check for valid number of registers to read" has been added to the 5.4-stable tree

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This is a note to let you know that I've just added the patch titled

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

to the 5.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-amdgpu-check-for-valid-number-of-registers-to-re.patch
and it can be found in the queue-5.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 372f39b1ccd3c61def56a711094e42342251b07e
Author: Trek <trek00@xxxxxxxx>
Date:   Sat Aug 31 21:25:36 2019 +0200

    drm/amdgpu: Check for valid number of registers to read
    
    [ Upstream commit 13238d4fa6764fa74dcf863d5f2227765b3753eb ]
    
    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@xxxxxxxx>
    Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
index 26a1173df9586..1f4acb4c3efb8 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
@@ -650,6 +650,9 @@ static int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file
 		if (info->read_mmr_reg.count > 128)
 			return -EINVAL;
 
+		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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