--- /dev/null
+From 3f4e54bd312d3dafb59daf2b97ffa08abebe60f5 Mon Sep 17 00:00:00 2001
+From: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
+Date: Wed, 27 Oct 2021 16:27:30 +0200
+Subject: drm/amdgpu: Fix even more out of bound writes from debugfs
+
+From: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
+
+commit 3f4e54bd312d3dafb59daf2b97ffa08abebe60f5 upstream.
+
+CVE-2021-42327 was fixed by:
+
+commit f23750b5b3d98653b31d4469592935ef6364ad67
+Author: Thelford Williams <tdwilliamsiv@gmail.com>
+Date: Wed Oct 13 16:04:13 2021 -0400
+
+ drm/amdgpu: fix out of bounds write
+
+but amdgpu_dm_debugfs.c contains more of the same issue so fix the
+remaining ones.
+
+v2:
+ * Add missing fix in dp_max_bpc_write (Harry Wentland)
+
+Fixes: 918698d5c2b5 ("drm/amd/display: Return the number of bytes parsed than allocated")
+Signed-off-by: Patrik Jakobsson <pjakobsson@suse.de>
+Reviewed-by: Harry Wentland <harry.wentland@amd.com>
+Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
+Cc: stable@vger.kernel.org
+[ Cherry-pick the fix and drop the following functions which were introduced
+ since 5.13 or later: dp_max_bpc_write() was introduced in commit cca912e0a6b4
+ ("drm/amd/display: Add max bpc debugfs") dp_dsc_passthrough_set() was
+ introduced in commit fcd1e484c8ae ("drm/amd/display: Add debugfs entry for
+ dsc passthrough"). ]
+Signed-off-by: Xiangyu Chen <xiangyu.chen@windriver.com>
+Signed-off-by: He Zhe <zhe.he@windriver.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c | 14 +++++++-------
+ 1 file changed, 7 insertions(+), 7 deletions(-)
+
+--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
++++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
+@@ -424,7 +424,7 @@ static ssize_t dp_phy_settings_write(str
+ if (!wr_buf)
+ return -ENOSPC;
+
+- if (parse_write_buffer_into_params(wr_buf, size,
++ if (parse_write_buffer_into_params(wr_buf, wr_buf_size,
+ (long *)param, buf,
+ max_param_num,
+ ¶m_nums)) {
+@@ -576,7 +576,7 @@ static ssize_t dp_phy_test_pattern_debug
+ if (!wr_buf)
+ return -ENOSPC;
+
+- if (parse_write_buffer_into_params(wr_buf, size,
++ if (parse_write_buffer_into_params(wr_buf, wr_buf_size,
+ (long *)param, buf,
+ max_param_num,
+ ¶m_nums)) {
+@@ -1091,7 +1091,7 @@ static ssize_t dp_trigger_hotplug(struct
+ return -ENOSPC;
+ }
+
+- if (parse_write_buffer_into_params(wr_buf, size,
++ if (parse_write_buffer_into_params(wr_buf, wr_buf_size,
+ (long *)param, buf,
+ max_param_num,
+ ¶m_nums)) {
+@@ -1272,7 +1272,7 @@ static ssize_t dp_dsc_clock_en_write(str
+ return -ENOSPC;
+ }
+
+- if (parse_write_buffer_into_params(wr_buf, size,
++ if (parse_write_buffer_into_params(wr_buf, wr_buf_size,
+ (long *)param, buf,
+ max_param_num,
+ ¶m_nums)) {
+@@ -1426,7 +1426,7 @@ static ssize_t dp_dsc_slice_width_write(
+ return -ENOSPC;
+ }
+
+- if (parse_write_buffer_into_params(wr_buf, size,
++ if (parse_write_buffer_into_params(wr_buf, wr_buf_size,
+ (long *)param, buf,
+ max_param_num,
+ ¶m_nums)) {
+@@ -1580,7 +1580,7 @@ static ssize_t dp_dsc_slice_height_write
+ return -ENOSPC;
+ }
+
+- if (parse_write_buffer_into_params(wr_buf, size,
++ if (parse_write_buffer_into_params(wr_buf, wr_buf_size,
+ (long *)param, buf,
+ max_param_num,
+ ¶m_nums)) {
+@@ -1727,7 +1727,7 @@ static ssize_t dp_dsc_bits_per_pixel_wri
+ return -ENOSPC;
+ }
+
+- if (parse_write_buffer_into_params(wr_buf, size,
++ if (parse_write_buffer_into_params(wr_buf, wr_buf_size,
+ (long *)param, buf,
+ max_param_num,
+ ¶m_nums)) {