FAILED: patch "[PATCH] drm/amdgpu: Check cs flags." failed to apply to 6.6-stable tree

[Sasha Levin <sashal@kernel.org>]

The patch below does not apply to the 6.6-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y
git checkout FETCH_HEAD
git cherry-pick -x f5ea64f9fcd921bc4e2307a262e19450b8a58524
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '20261109201357-failed-6.6-f5ea64f9fcd9@kernel.org' --subject-prefix 'PATCH 6.6.y' 'HEAD^..'

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------

From f5ea64f9fcd921bc4e2307a262e19450b8a58524 Mon Sep 17 00:00:00 2001
From: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Date: Thu, 22 Oct 2026 01:30:54 +0100
Subject: [PATCH] drm/amdgpu: Check cs flags.

Had no validation before. libdrm_amdgpu memsets this, even
for the raw/raw2 functions.

We have a lot of functions touching the ioctl struct, no
strong opinion on where this is placed, but I thought
early would be good.

Signed-off-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Reviewed-by: Faith Ekstrand <faith.ekstrand@collabora.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 4d01e15e76358f60ef6734462d2b6d9972b9dfbc)
Cc: stable@vger.kernel.org
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
index d69018a14d96d..a703268ceebaa 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
@@ -189,6 +189,9 @@ static int amdgpu_cs_pass1(struct amdgpu_cs_parser *p,
 	int ret;
 	int i;
 
+	if (cs->in.flags)
+		return -EINVAL;
+
 	chunk_array = memdup_array_user(u64_to_user_ptr(cs->in.chunks),
 					cs->in.num_chunks,
 					sizeof(uint64_t));
-- 
2.53.0