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authorTomi Valkeinen <tomi.valkeinen@ti.com>2018-05-02 12:11:57 +0300
committerSean Paul <seanpaul@chromium.org>2018-05-07 10:19:12 -0400
commite1cdab6e5f9a52e0bdf34363ec0fdab0e2328ba9 (patch)
tree486480c0937ea85acd63ff2d137cb9700e2c9f13 /drivers
parent4d6cb5e2fee52af17001e92950f0894304706ee4 (diff)
downloadlinux-e1cdab6e5f9a52e0bdf34363ec0fdab0e2328ba9.tar.bz2
drm/omap: handle error if scale coefs are not found
If get_scale_coef functions fail, they return NULL, but we never check the return value and could do a NULL deref. This should not happen as we ought to validate the amount of scaling already earlier, but to be safe, add the necessary check. Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180502091159.7071-3-tomi.valkeinen@ti.com Reviewed-by: Benoit Parrot <bparrot@ti.com> Reviewed-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Signed-off-by: Sean Paul <seanpaul@chromium.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/gpu/drm/omapdrm/dss/dispc.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/gpu/drm/omapdrm/dss/dispc.c b/drivers/gpu/drm/omapdrm/dss/dispc.c
index 5e2e65e88847..b8fdb63e5bb3 100644
--- a/drivers/gpu/drm/omapdrm/dss/dispc.c
+++ b/drivers/gpu/drm/omapdrm/dss/dispc.c
@@ -828,6 +828,12 @@ static void dispc_ovl_set_scale_coef(struct dispc_device *dispc,
h_coef = dispc_ovl_get_scale_coef(fir_hinc, true);
v_coef = dispc_ovl_get_scale_coef(fir_vinc, five_taps);
+ if (!h_coef || !v_coef) {
+ dev_err(&dispc->pdev->dev, "%s: failed to find scale coefs\n",
+ __func__);
+ return;
+ }
+
for (i = 0; i < 8; i++) {
u32 h, hv;