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Wed, 11 Nov 2026 14:01:41 -0800 (PST) Received: from ryzen.lan ([2601:644:8000:37f::e34]) by smtp.gmail.com with ESMTPSA id 586e51a60fabf-4ae23095c5csm4206140fac.16.2026.11.11.14.01.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 Nov 2026 14:01:39 -0800 (PST) From: Rosen Penev To: Inki Dae , Seung-Woo Kim , Kyungmin Park , David Airlie , Simona Vetter , Krzysztof Kozlowski , Peter Griffin , Kees Cook Cc: Alim Akhtar , "Gustavo A. R. Silva" , dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH v2] drm/exynos: fimc: allocate formats as a flexible array member Date: Wed, 11 Nov 2026 14:01:29 -0800 Message-ID: <20261111220129.12128-1-rosenp@gmail.com> X-Mailer: git-send-email 2.56.1 X-Archived-By: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261111_140142_484624_7EC1AC35 X-CRM114-Status: GOOD ( 14.51 ) X-Spam-Score: -2.1 (--) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 The formats array is allocated separately with devm_kcalloc() and only referenced through the fimc_context. Make it a flexible array member at the end of the context and allocate both in one go. Annotate it with __counted_by(num_formats) so the array accesses can be bounds checked with FORTIFY_SOURCE and UBSAN_BOUNDS. Signed-off-by: Rosen Penev --- v2: use devm_kzalloc_flex(). drivers/gpu/drm/exynos/exynos_drm_fimc.c | 16 +++++----------- 1 file changed, 5 insertions(+), 11 deletions(-) diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimc.c b/drivers/gpu/drm/exynos/exynos_drm_fimc.c index 9c2ad95799ee..9233cd3b2f04 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_fimc.c +++ b/drivers/gpu/drm/exynos/exynos_drm_fimc.c @@ -99,7 +99,6 @@ struct fimc_context { void *dma_priv; struct device *dev; struct exynos_drm_ipp_task *task; - struct exynos_drm_ipp_formats *formats; unsigned int num_formats; void __iomem *regs; @@ -108,6 +107,7 @@ struct fimc_context { struct fimc_scaler sc; int id; int irq; + struct exynos_drm_ipp_formats formats[] __counted_by(num_formats); }; static u32 fimc_read(struct fimc_context *ctx, u32 reg) @@ -1273,19 +1273,16 @@ static int fimc_probe(struct platform_device *pdev) if (exynos_drm_check_fimc_device(dev) != 0) return -ENODEV; - ctx = devm_kzalloc_obj(dev, *ctx); + num_formats = ARRAY_SIZE(fimc_formats) + ARRAY_SIZE(fimc_tiled_formats); + ctx = devm_kzalloc_flex(dev,*ctx, formats, num_formats); if (!ctx) return -ENOMEM; + ctx->num_formats = num_formats; + formats = ctx->formats; ctx->dev = dev; ctx->id = of_alias_get_id(dev->of_node, "fimc"); - /* construct formats/limits array */ - num_formats = ARRAY_SIZE(fimc_formats) + ARRAY_SIZE(fimc_tiled_formats); - formats = devm_kzalloc_objs(dev, *formats, num_formats); - if (!formats) - return -ENOMEM; - /* linear formats */ if (ctx->id < 3) { limits = fimc_4210_limits_v1; @@ -1319,9 +1316,6 @@ static int fimc_probe(struct platform_device *pdev) formats[j].num_limits = num_limits; } - ctx->formats = formats; - ctx->num_formats = num_formats; - /* resource memory */ ctx->regs = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(ctx->regs)) -- 2.56.1