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Lin" , Singo Chang , Nancy Lin , Shawn Sung , , , , , Subject: [PATCH 4/5] drm/mediatek: Add casting before assign Date: Fri, 7 Apr 2023 14:46:56 +0800 Message-ID: <20230407064657.12350-5-jason-jh.lin@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20230407064657.12350-1-jason-jh.lin@mediatek.com> References: <20230407064657.12350-1-jason-jh.lin@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230406_234710_374612_BA1EF7E5 X-CRM114-Status: GOOD ( 12.58 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org Add casting before assign to avoid the unintentional integer overflow or unintended sign extension. Signed-off-by: Jason-JH.Lin Fixes: 1a64a7aff8da ("drm/mediatek: Fix cursor plane no update") --- drivers/gpu/drm/mediatek/mtk_drm_gem.c | 2 +- drivers/gpu/drm/mediatek/mtk_drm_plane.c | 20 +++++++++++--------- 2 files changed, 12 insertions(+), 10 deletions(-) diff --git a/drivers/gpu/drm/mediatek/mtk_drm_gem.c b/drivers/gpu/drm/mediatek/mtk_drm_gem.c index 9b8f72ed12e4..537e83b95001 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_gem.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_gem.c @@ -121,7 +121,7 @@ int mtk_drm_gem_dumb_create(struct drm_file *file_priv, struct drm_device *dev, int ret; args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8); - args->size = args->pitch * args->height; + args->size = (unsigned long)args->pitch * args->height; mtk_gem = mtk_drm_gem_create(dev, args->size, false); if (IS_ERR(mtk_gem)) diff --git a/drivers/gpu/drm/mediatek/mtk_drm_plane.c b/drivers/gpu/drm/mediatek/mtk_drm_plane.c index 31f9420aff6f..a1337f386bbf 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_plane.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_plane.c @@ -140,7 +140,7 @@ static void mtk_plane_update_new_state(struct drm_plane_state *new_state, struct drm_framebuffer *fb = new_state->fb; struct drm_gem_object *gem; struct mtk_drm_gem_obj *mtk_gem; - unsigned int pitch, format; + unsigned int pitch, format, cpp; u64 modifier; dma_addr_t addr; dma_addr_t hdr_addr = 0; @@ -151,11 +151,12 @@ static void mtk_plane_update_new_state(struct drm_plane_state *new_state, addr = mtk_gem->dma_addr; pitch = fb->pitches[0]; format = fb->format->format; + cpp = (unsigned int)fb->format->cpp[0]; modifier = fb->modifier; if (modifier == DRM_FORMAT_MOD_LINEAR) { - addr += (new_state->src.x1 >> 16) * fb->format->cpp[0]; - addr += (new_state->src.y1 >> 16) * pitch; + addr += (dma_addr_t)(new_state->src.x1 >> 16) * cpp; + addr += (dma_addr_t)(new_state->src.y1 >> 16) * pitch; } else { int width_in_blocks = ALIGN(fb->width, AFBC_DATA_BLOCK_WIDTH) / AFBC_DATA_BLOCK_WIDTH; @@ -167,17 +168,18 @@ static void mtk_plane_update_new_state(struct drm_plane_state *new_state, hdr_pitch = width_in_blocks * AFBC_HEADER_BLOCK_SIZE; pitch = width_in_blocks * AFBC_DATA_BLOCK_WIDTH * - AFBC_DATA_BLOCK_HEIGHT * fb->format->cpp[0]; + AFBC_DATA_BLOCK_HEIGHT * cpp; hdr_size = ALIGN(hdr_pitch * height_in_blocks, AFBC_HEADER_ALIGNMENT); - hdr_addr = addr + hdr_pitch * y_offset_in_blocks + - AFBC_HEADER_BLOCK_SIZE * x_offset_in_blocks; + hdr_addr = addr + + (dma_addr_t)hdr_pitch * y_offset_in_blocks + + (dma_addr_t)AFBC_HEADER_BLOCK_SIZE * x_offset_in_blocks; /* The data plane is offset by 1 additional block. */ addr = addr + hdr_size + - pitch * y_offset_in_blocks + - AFBC_DATA_BLOCK_WIDTH * AFBC_DATA_BLOCK_HEIGHT * - fb->format->cpp[0] * (x_offset_in_blocks + 1); + (dma_addr_t)pitch * y_offset_in_blocks + + (dma_addr_t)AFBC_DATA_BLOCK_WIDTH * AFBC_DATA_BLOCK_HEIGHT * + (dma_addr_t)cpp * (x_offset_in_blocks + 1); } mtk_plane_state->pending.enable = true;