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-rw-r--r--src/shared/varlink.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/shared/varlink.c b/src/shared/varlink.c
index 6b985a4c9b..808e2b2dba 100644
--- a/src/shared/varlink.c
+++ b/src/shared/varlink.c
@@ -3063,7 +3063,9 @@ int varlink_server_deserialize_one(VarlinkServer *s, const char *value, FDSet *f
r = safe_atoi(buf, &fd);
if (r < 0)
return log_debug_errno(r, "Unable to parse VarlinkServerSocket varlink-server-socket-fd=%s: %m", buf);
-
+ if (fd < 0)
+ return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
+ "VarlinkServerSocket varlink-server-socket-fd= has an invalid value: %d", fd);
if (!fdset_contains(fds, fd))
return log_debug_errno(SYNTHETIC_ERRNO(EBADF),
"VarlinkServerSocket varlink-server-socket-fd= has unknown fd %d: %m", fd);