diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/libc/gen/ttyname.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/libc/gen/ttyname.c b/lib/libc/gen/ttyname.c index 02aa158..6628e3b 100644 --- a/lib/libc/gen/ttyname.c +++ b/lib/libc/gen/ttyname.c @@ -61,6 +61,10 @@ ttyname_r(int fd, char *buf, size_t len) { 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. */ |
