fix out-of-bounds reads in __dns_parse

[musl] / src / ldso / dlinfo.c

diff --git a/src/ldso/dlinfo.c b/src/ldso/dlinfo.c
index 63d276d..b55f5fe 100644 (file)
--- a/src/ldso/dlinfo.c
+++ b/src/ldso/dlinfo.c
@@ -1,9 +1,14 @@
 #define _GNU_SOURCE
 #include <dlfcn.h>
-
-int __dlinfo(void *, int, void *);
+#include "dynlink.h"
 
 int dlinfo(void *dso, int req, void *res)
 {
-       return __dlinfo(dso, req, res);
+       if (__dl_invalid_handle(dso)) return -1;
+       if (req != RTLD_DI_LINKMAP) {
+               __dl_seterr("Unsupported request %d", req);
+               return -1;
+       }
+       *(struct link_map **)res = dso;
+       return 0;
 }