getservbyport_r: fix out-of-bounds buffer read

[musl] / src / unistd / ttyname_r.c

diff --git a/src/unistd/ttyname_r.c b/src/unistd/ttyname_r.c
index cb364c2..82acb75 100644 (file)
--- a/src/unistd/ttyname_r.c
+++ b/src/unistd/ttyname_r.c
@@ -9,7 +9,7 @@ int ttyname_r(int fd, char *name, size_t size)
        char procname[sizeof "/proc/self/fd/" + 3*sizeof(int) + 2];
        ssize_t l;
 
-       if (!isatty(fd)) return ENOTTY;
+       if (!isatty(fd)) return errno;
 
        __procfdname(procname, fd);
        l = readlink(procname, name, size);