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Index: head/lib/libc/gen/ttyname.c
===================================================================
--- head/lib/libc/gen/ttyname.c
+++ head/lib/libc/gen/ttyname.c
@@ -61,6 +61,10 @@
{
size_t used;
+ /* Don't write off the end of a zero-length buffer. */
+ if (len < 1)
+ return (ERANGE);
+
*buf = '\0';
/* Must be a terminal. */

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