kcalloc returns NULL on failure. Hence check for the return value and exit on error to avoid NULL pointer dereference.
Fixes the following smatch errors: drivers/gpu/drm/drm_fb_helper.c:1271 drm_setup_crtcs() error: potential null dereference 'modes'. (kcalloc returns null) drivers/gpu/drm/drm_fb_helper.c:1272 drm_setup_crtcs() error: potential null dereference 'crtcs'. (kcalloc returns null) Signed-off-by: Sachin Kamat <sachin.kamat at linaro.org> --- Dependent on the following patch series: http://comments.gmane.org/gmane.comp.video.dri.devel/76605 --- drivers/gpu/drm/drm_fb_helper.c | 6 ++++++ 1 files changed, 6 insertions(+), 0 deletions(-) diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index 8c2de02..fc67cc5 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -1251,6 +1251,11 @@ static void drm_setup_crtcs(struct drm_fb_helper *fb_helper) sizeof(struct drm_display_mode *), GFP_KERNEL); enabled = kcalloc(dev->mode_config.num_connector, sizeof(bool), GFP_KERNEL); + if (!crtcs || !modes || !enabled) { + DRM_ERROR("Memory allocation failed\n"); + goto out; + } + drm_enable_connectors(fb_helper, enabled); @@ -1289,6 +1294,7 @@ static void drm_setup_crtcs(struct drm_fb_helper *fb_helper) } } +out: kfree(crtcs); kfree(modes); kfree(enabled); -- 1.7.4.1
