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diff --git a/tools/gif2tiff.c b/tools/gif2tiff.c
index 375b152..2731273 100644
--- a/tools/gif2tiff.c
+++ b/tools/gif2tiff.c
@@ -402,6 +402,10 @@ process(register int code, unsigned char** fill)
}
if (oldcode == -1) {
+ if (code >= clear) {
+ fprintf(stderr, "bad input: code=%d is larger than clear=%d\n",code, clear);
+ return 0;
+ }
*(*fill)++ = suffix[code];
firstchar = oldcode = code;
return 1;
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