drm/amdgpu: Fix even more out of bound writes from debugfs

CVE-2021-42327 was fixed by:

commit f23750b5
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: 918698d5 ("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>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c

@@ -491,7 +491,7 @@ static ssize_t dp_phy_settings_write(struct file *f, const char __user *buf,
 	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,
 					   &param_nums)) {
@@ -643,7 +643,7 @@ static ssize_t dp_phy_test_pattern_debugfs_write(struct file *f, const char __us
 	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,
 					   &param_nums)) {
@@ -918,7 +918,7 @@ static ssize_t dp_dsc_passthrough_set(struct file *f, const char __user *buf,
 		return -ENOSPC;
 	}
 
-	if (parse_write_buffer_into_params(wr_buf, size,
+	if (parse_write_buffer_into_params(wr_buf, wr_buf_size,
 					   &param, buf,
 					   max_param_num,
 					   &param_nums)) {
@@ -1215,7 +1215,7 @@ static ssize_t trigger_hotplug(struct file *f, const char __user *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,
 						&param_nums)) {
@@ -1400,7 +1400,7 @@ static ssize_t dp_dsc_clock_en_write(struct file *f, const char __user *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,
 					    &param_nums)) {
@@ -1585,7 +1585,7 @@ static ssize_t dp_dsc_slice_width_write(struct file *f, const char __user *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,
 					    &param_nums)) {
@@ -1770,7 +1770,7 @@ static ssize_t dp_dsc_slice_height_write(struct file *f, const char __user *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,
 					    &param_nums)) {
@@ -1948,7 +1948,7 @@ static ssize_t dp_dsc_bits_per_pixel_write(struct file *f, const char __user *bu
 		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,
 					    &param_nums)) {
@@ -2386,7 +2386,7 @@ static ssize_t dp_max_bpc_write(struct file *f, const char __user *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,
 					   &param_nums)) {