On Mon, Jun 25, 2018 at 07:18:44AM -0500, Gustavo A. R. Silva wrote:
fb is being dereferenced before it is null checked, hence there is a potential null pointer dereference.
Fix this by moving the pointer dereference after fb has been properly null checked at line 74: if (!fb)
I don't remember if set_base w/ fb==NULL is even legal. But as long as the check is there this seems sane. Pushed to drm-misc-next. Thanks for the patch.
Addresses-Coverity-ID: 1470169 ("Dereference before null check") Signed-off-by: Gustavo A. R. Silva gustavo@embeddedor.com
drivers/gpu/drm/gma500/gma_display.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/gma500/gma_display.c b/drivers/gpu/drm/gma500/gma_display.c index c8f071c..f767579 100644 --- a/drivers/gpu/drm/gma500/gma_display.c +++ b/drivers/gpu/drm/gma500/gma_display.c @@ -60,7 +60,7 @@ int gma_pipe_set_base(struct drm_crtc *crtc, int x, int y, struct drm_psb_private *dev_priv = dev->dev_private; struct gma_crtc *gma_crtc = to_gma_crtc(crtc); struct drm_framebuffer *fb = crtc->primary->fb;
- struct gtt_range *gtt = to_gtt_range(fb->obj[0]);
- struct gtt_range *gtt; int pipe = gma_crtc->pipe; const struct psb_offset *map = &dev_priv->regmap[pipe]; unsigned long start, offset;
@@ -76,6 +76,8 @@ int gma_pipe_set_base(struct drm_crtc *crtc, int x, int y, goto gma_pipe_cleaner; }
- gtt = to_gtt_range(fb->obj[0]);
- /* We are displaying this buffer, make sure it is actually loaded into the GTT */ ret = psb_gtt_pin(gtt);
-- 2.7.4
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