socket-util: slight rework of getpeersec()

Let's call getsockopt() in a loop, so that we can deal correctly with
the label changing while we are trying to read it.

(also, while we are at it, let's make sure that there's always one
trailing NUL byte at the end of the buffer, after all SO_PEERSEC has
zero documentation, and multiple implementing backends, hence let's
better be safe than sorry)

1 files changed, 11 insertions, 20 deletions

diff --git a/src/basic/socket-util.c b/src/basic/socket-util.c
index 860c8fbfc..c89e5c8c7 100644
--- a/src/basic/socket-util.c
+++ b/src/basic/socket-util.c
@@ -987,41 +987,32 @@ int getpeercred(int fd, struct ucred *ucred) {
 }
 
 int getpeersec(int fd, char **ret) {
+        _cleanup_free_ char *s = NULL;
         socklen_t n = 64;
-        char *s;
-        int r;
 
         assert(fd >= 0);
         assert(ret);
 
-        s = new0(char, n);
-        if (!s)
-                return -ENOMEM;
+        for (;;) {
+                s = new0(char, n+1);
+                if (!s)
+                        return -ENOMEM;
 
-        r = getsockopt(fd, SOL_SOCKET, SO_PEERSEC, s, &n);
-        if (r < 0) {
-                free(s);
+                if (getsockopt(fd, SOL_SOCKET, SO_PEERSEC, s, &n) >= 0)
+                        break;
 
                 if (errno != ERANGE)
                         return -errno;
 
-                s = new0(char, n);
-                if (!s)
-                        return -ENOMEM;
-
-                r = getsockopt(fd, SOL_SOCKET, SO_PEERSEC, s, &n);
-                if (r < 0) {
-                        free(s);
-                        return -errno;
-                }
+                s = mfree(s);
         }
 
-        if (isempty(s)) {
-                free(s);
+        if (isempty(s))
                 return -EOPNOTSUPP;
-        }
 
         *ret = s;
+        s = NULL;
+
         return 0;
 }