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-rw-r--r--src/common/grfio.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/common/grfio.c b/src/common/grfio.c
index d226fb158..e95163569 100644
--- a/src/common/grfio.c
+++ b/src/common/grfio.c
@@ -645,6 +645,7 @@ static int grfio_entryread(const char *grfname, int gentry)
aFree(rBuf);
entrys = getlong(grf_header+0x26) - 7;
+ Assert_retr(4, entrys >= 0);
// Get an entry
for (entry = 0, ofs = 0; entry < entrys; ++entry) {