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

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

1 files changed, 8 insertions, 1 deletions

diff --git a/libbb/pw_encrypt.c b/libbb/pw_encrypt.c
index 39ffa084f..bfc7030a8 100644
--- 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