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drm/omap: handle error if scale coefs are not found

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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>
This commit is contained in:
Tomi Valkeinen 2018-05-02 12:11:57 +03:00 committed by Sean Paul
parent 4d6cb5e2fe
commit e1cdab6e5f
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/omapdrm/dss/dispc.c
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@ -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;