linux-kernel - [PATCH 3/4] drm/amd/display: change kzalloc to kcalloc in dcn314_validate

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Message-Id: <20250227-amd-display-v1-3-52a060a78d08@ethancedwards.com>
Date: Thu, 27 Feb 2025 18:16:23 -0500
From: Ethan Carter Edwards <ethan@...ancedwards.com>
To: Harry Wentland <harry.wentland@....com>, Leo Li <sunpeng.li@....com>, 
 Rodrigo Siqueira <siqueira@...lia.com>, 
 Alex Deucher <alexander.deucher@....com>, 
 Christian König <christian.koenig@....com>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>
Cc: amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org, 
 linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org, 
 Ethan Carter Edwards <ethan@...ancedwards.com>
Subject: [PATCH 3/4] drm/amd/display: change kzalloc to kcalloc in
 dcn314_validate_bandwidth()

We are trying to get rid of all multiplications from allocation
functions to prevent integer overflows. Here the multiplication is
probably safe, but using kcalloc() is more appropriate and improves
readability. This patch has no effect on runtime behavior.

Signed-off-by: Ethan Carter Edwards <ethan@...ancedwards.com>
---
 drivers/gpu/drm/amd/display/dc/resource/dcn314/dcn314_resource.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/resource/dcn314/dcn314_resource.c b/drivers/gpu/drm/amd/display/dc/resource/dcn314/dcn314_resource.c
index e3ba105034f83434c3e77d343ee267069d34d926..26becc4cb80408cb2778f6af62c7a1c497f06505 100644
--- a/drivers/gpu/drm/amd/display/dc/resource/dcn314/dcn314_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/resource/dcn314/dcn314_resource.c
@@ -1704,7 +1704,8 @@ bool dcn314_validate_bandwidth(struct dc *dc,
 
 	int vlevel = 0;
 	int pipe_cnt = 0;
-	display_e2e_pipe_params_st *pipes = kzalloc(dc->res_pool->pipe_count * sizeof(display_e2e_pipe_params_st), GFP_KERNEL);
+	display_e2e_pipe_params_st *pipes = kcalloc(dc->res_pool->pipe_count,
+			sizeof(display_e2e_pipe_params_st), GFP_KERNEL);
 	DC_LOGGER_INIT(dc->ctx->logger);
 
 	BW_VAL_TRACE_COUNT();

-- 
2.48.1