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diff --git a/src/gd_gd2.c b/src/gd_gd2.c
index 6f28461..a50b33d 100644
--- a/src/gd_gd2.c
+++ b/src/gd_gd2.c
@@ -165,6 +165,8 @@ _gd2GetHeader (gdIOCtxPtr in, int *sx, int *sy,
if (gdGetInt (&cidx[i].size, in) != 1) {
goto fail2;
};
+ if (cidx[i].offset < 0 || cidx[i].size < 0)
+ goto fail2;
};
*chunkIdx = cidx;
};
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