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diff -Nrbu mailx-12.5/lzw.c mailx-12.5-OK/lzw.c
--- mailx-12.5/lzw.c 2006-03-04 03:32:16.000000000 +0300
+++ mailx-12.5-OK/lzw.c 2011-08-17 16:30:01.000000000 +0400
@@ -516,6 +516,8 @@
/* Generate output characters in reverse order. */
while (code >= 256) {
+ if (stackp - de_stack >= HSIZE - 1)
+ return -1;
*stackp++ = tab_suffixof(code);
code = tab_prefixof(code);
}