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-rw-r--r--src/shared/util.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/src/shared/util.c b/src/shared/util.c
index e7ff0f8840..1709bb70ca 100644
--- a/src/shared/util.c
+++ b/src/shared/util.c
@@ -280,6 +280,14 @@ int parse_uid(const char *s, uid_t* ret_uid) {
if ((unsigned long) uid != ul)
return -ERANGE;
+ /* Some libc APIs use (uid_t) -1 as special placeholder */
+ if (uid == (uid_t) 0xFFFFFFFF)
+ return -EINVAL;
+
+ /* A long time ago UIDs where 16bit, hence explicitly avoid the 32bit -1 too */
+ if (uid == (uid_t) 0xFFFF)
+ return -EINVAL;
+
*ret_uid = uid;
return 0;
}