From 533950d32d292cc4d0cef5b85af57948b8dcb11a Mon Sep 17 00:00:00 2001 From: Azeem Shaikh Date: Mon, 22 May 2023 15:51:24 +0000 Subject: [PATCH] drm/display/dp_mst: Replace all non-returning strlcpy with strscpy strlcpy() reads the entire source buffer first. This read may exceed the destination size limit. This is both inefficient and can lead to linear read overflows if a source string is not NUL-terminated [1]. In an effort to remove strlcpy() completely [2], replace strlcpy() here with strscpy(). No return values were used, so direct replacement is safe. [1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy [2] https://github.com/KSPP/linux/issues/89 Signed-off-by: Azeem Shaikh Reviewed-by: Kees Cook Signed-off-by: Kees Cook Link: https://lore.kernel.org/r/20230522155124.2336545-1-azeemshaikh38@gmail.com --- drivers/gpu/drm/display/drm_dp_helper.c | 2 +- drivers/gpu/drm/display/drm_dp_mst_topology.c | 2 +- drivers/gpu/drm/drm_mipi_dsi.c | 2 +- 3 files changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/display/drm_dp_helper.c b/drivers/gpu/drm/display/drm_dp_helper.c index 16565a0a5da6d..e6a78fd32380a 100644 --- a/drivers/gpu/drm/display/drm_dp_helper.c +++ b/drivers/gpu/drm/display/drm_dp_helper.c @@ -2103,7 +2103,7 @@ int drm_dp_aux_register(struct drm_dp_aux *aux) aux->ddc.owner = THIS_MODULE; aux->ddc.dev.parent = aux->dev; - strlcpy(aux->ddc.name, aux->name ? aux->name : dev_name(aux->dev), + strscpy(aux->ddc.name, aux->name ? aux->name : dev_name(aux->dev), sizeof(aux->ddc.name)); ret = drm_dp_aux_register_devnode(aux); diff --git a/drivers/gpu/drm/display/drm_dp_mst_topology.c b/drivers/gpu/drm/display/drm_dp_mst_topology.c index 38dab76ae69ea..8f7403149b2bd 100644 --- a/drivers/gpu/drm/display/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/display/drm_dp_mst_topology.c @@ -5702,7 +5702,7 @@ static int drm_dp_mst_register_i2c_bus(struct drm_dp_mst_port *port) aux->ddc.dev.parent = parent_dev; aux->ddc.dev.of_node = parent_dev->of_node; - strlcpy(aux->ddc.name, aux->name ? aux->name : dev_name(parent_dev), + strscpy(aux->ddc.name, aux->name ? aux->name : dev_name(parent_dev), sizeof(aux->ddc.name)); return i2c_add_adapter(&aux->ddc); diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c index 3fd6c733ff4e3..6252ac01e945a 100644 --- a/drivers/gpu/drm/drm_mipi_dsi.c +++ b/drivers/gpu/drm/drm_mipi_dsi.c @@ -223,7 +223,7 @@ mipi_dsi_device_register_full(struct mipi_dsi_host *host, device_set_node(&dsi->dev, of_fwnode_handle(info->node)); dsi->channel = info->channel; - strlcpy(dsi->name, info->type, sizeof(dsi->name)); + strscpy(dsi->name, info->type, sizeof(dsi->name)); ret = mipi_dsi_device_add(dsi); if (ret) { -- 2.30.2