From 4168720753ce6c14c5d3a35302fc2e1841383443 Mon Sep 17 00:00:00 2001 From: Moudy Ho Date: Mon, 27 Mar 2023 11:13:24 +0800 Subject: [PATCH] media: platform: mtk-mdp3: fix potential frame size overflow in mdp_try_fmt_mplane() Fix overflow risk when setting certain formats whose frame size exceeds a RGB24 with 7723x7723 resolution. For example, a 7723x7724 RGB24 frame: 1. bpl (byte per line) = 7723 * 3. 2. Overflow occurs when bpl * 7724 * depth. Fixes: 61890ccaefaf ("media: platform: mtk-mdp3: add MediaTek MDP3 driver") Signed-off-by: Moudy Ho Signed-off-by: Hans Verkuil --- drivers/media/platform/mediatek/mdp3/mtk-mdp3-regs.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-regs.c b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-regs.c index 4e84a37ecdfc1..36336d169bd91 100644 --- a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-regs.c +++ b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-regs.c @@ -4,6 +4,7 @@ * Author: Ping-Hsun Wu */ +#include #include #include #include @@ -428,14 +429,15 @@ const struct mdp_format *mdp_try_fmt_mplane(struct v4l2_format *f, u32 bpl = pix_mp->plane_fmt[i].bytesperline; u32 min_si, max_si; u32 si = pix_mp->plane_fmt[i].sizeimage; + u64 di; bpl = clamp(bpl, min_bpl, max_bpl); pix_mp->plane_fmt[i].bytesperline = bpl; - min_si = (bpl * pix_mp->height * fmt->depth[i]) / - fmt->row_depth[i]; - max_si = (bpl * s.max_height * fmt->depth[i]) / - fmt->row_depth[i]; + di = (u64)bpl * pix_mp->height * fmt->depth[i]; + min_si = (u32)div_u64(di, fmt->row_depth[i]); + di = (u64)bpl * s.max_height * fmt->depth[i]; + max_si = (u32)div_u64(di, fmt->row_depth[i]); si = clamp(si, min_si, max_si); pix_mp->plane_fmt[i].sizeimage = si; -- 2.30.2