libbb: don't die if crypt() returns NULL

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

diff --git a/libbb/pw_encrypt.c b/libbb/pw_encrypt.c
index 39ffa084f29a81ce2817e15a9547a0e9d3fb74a8..bfc7030a8387f81daa44ce8f1ccc6f50e3380233 100644 (file)
--- a/libbb/pw_encrypt.c
+++ b/libbb/pw_encrypt.c
@@ -142,7 +142,14 @@ char* FAST_FUNC pw_encrypt(const char *clear, const char *salt, int cleanup)
 
 char* FAST_FUNC pw_encrypt(const char *clear, const char *salt, int cleanup)
 {
-       return xstrdup(crypt(clear, salt));
+       char *s;
+
+       s = crypt(clear, salt);
+       /*
+        * glibc used to return "" on malformed salts (for example, ""),
+        * but since 2.17 it returns NULL.
+        */
+       return xstrdup(s ? s : "");
 }
 
 #endif