Check per-channel max >= min in gain map metadata

Fixes AOMediaCodec#2573.
wantehchang · Jan 17, 2025 · 90b383c · 90b383c
1 parent e816c7d
commit 90b383c
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/src/gainmap.c b/src/gainmap.c
@@ -420,6 +420,11 @@ avifResult avifGainMapValidateMetadata(const avifGainMap * gainMap, avifDiagnost
             avifDiagnosticsPrintf(diag, "Per-channel denominator is 0 in gain map metadata");
             return AVIF_RESULT_INVALID_ARGUMENT;
         }
+        if ((int64_t)gainMap->gainMapMax[i].n * gainMap->gainMapMin[i].d <
+            (int64_t)gainMap->gainMapMin[i].n * gainMap->gainMapMax[i].d) {
+            avifDiagnosticsPrintf(diag, "Per-channel max is less than per-channel min in gain map metadata");
+            return AVIF_RESULT_INVALID_ARGUMENT;
+        }
         if (gainMap->gainMapGamma[i].n == 0) {
             avifDiagnosticsPrintf(diag, "Per-channel gamma is 0 in gain map metadata");
             return AVIF_RESULT_INVALID_ARGUMENT;