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Lin" , Singo Chang , Nancy Lin , Shawn Sung , , , , , Subject: [PATCH v4 2/4] drm/mediatek: Add cnt checking for coverity issue Date: Fri, 14 Jul 2023 17:49:06 +0800 Message-ID: <20230714094908.13087-3-jason-jh.lin@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20230714094908.13087-1-jason-jh.lin@mediatek.com> References: <20230714094908.13087-1-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-20230714_024916_731849_C6D04D87 X-CRM114-Status: GOOD ( 12.84 ) 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 CERT-C Characters and Strings (CERT STR31-C) all_drm_priv[cnt] evaluates to an address that could be at negative offset of an array. In mtk_drm_get_all_drm_priv(): Guarantee that storage for strings has sufficient space for character data and the null terminator. So change cnt to unsigned int and check its max value. Fixes: 1ef7ed48356c ("drm/mediatek: Modify mediatek-drm for mt8195 multi mmsys support") Signed-off-by: Jason-JH.Lin Reviewed-by: AngeloGioacchino Del Regno Reviewed-by: CK Hu Reviewed-by: Alexandre Mergnat --- drivers/gpu/drm/mediatek/mtk_drm_drv.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c index 6dcb4ba2466c..fc217e0acd45 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c @@ -354,7 +354,7 @@ static bool mtk_drm_get_all_drm_priv(struct device *dev) const struct of_device_id *of_id; struct device_node *node; struct device *drm_dev; - int cnt = 0; + unsigned int cnt = 0; int i, j; for_each_child_of_node(phandle->parent, node) { @@ -375,6 +375,9 @@ static bool mtk_drm_get_all_drm_priv(struct device *dev) all_drm_priv[cnt] = dev_get_drvdata(drm_dev); if (all_drm_priv[cnt] && all_drm_priv[cnt]->mtk_drm_bound) cnt++; + + if (cnt == MAX_CRTC) + break; } if (drm_priv->data->mmsys_dev_num == cnt) {