tree 1e0babc3409e9fb167a1230164785a6c7fb4ff41
parent fa61072a3b8582362956a4faa6339b19af43fb38
author Wan-Teh Chang <wtc@google.com> 1576256579 -0800
committer Wan-Teh Chang <wtc@google.com> 1711676385 +0000

Avoid the &arr[0] expression if arr may be NULL.

Change &arr[0] to the equivalent expression arr if arr may be a null
pointer.

This should fix the UBSAN runtime error at av1/common/quant_common.c:230:
applying zero offset to null pointer.

Also assert that cm->giqmatrix[qmlevel][plane][tx_size] and
cm->gqmatrix[qmlevel][plane][tx_size] are NULL only if qmlevel is equal
to NUM_QM_LEVELS - 1, matching the code in av1_qm_init().

BUG=oss-fuzz:19420

Change-Id: I1efde50c97bb395b0ffed2d73cb68b90ea63103d
(cherry picked from commit 6a715fb963f9323a9c95e104bbb1953f06523c37)