Btrfs: Free correct pointer after using strsep

We must save and free the original kstrdup()'ed pointer
because strsep() modifies its first argument.

Signed-off-by: Tero Roponen <tero.roponen@gmail.com>
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index f50253c2279deed1bb89f1c5576d85080c61b7fb..78ee681465affa61c11daabba0fd76c252bf8d30 100644 (file)
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -277,7 +277,7 @@ static int btrfs_parse_early_options(const char *options, fmode_t flags,
                struct btrfs_fs_devices **fs_devices)
 {
        substring_t args[MAX_OPT_ARGS];
-       char *opts, *p;
+       char *opts, *orig, *p;
        int error = 0;
        int intarg;
 
@@ -291,6 +291,7 @@ static int btrfs_parse_early_options(const char *options, fmode_t flags,
        opts = kstrdup(options, GFP_KERNEL);
        if (!opts)
                return -ENOMEM;
+       orig = opts;
 
        while ((p = strsep(&opts, ",")) != NULL) {
                int token;
@@ -326,7 +327,7 @@ static int btrfs_parse_early_options(const char *options, fmode_t flags,
        }
 
  out_free_opts:
-       kfree(opts);
+       kfree(orig);
  out:
        /*
         * If no subvolume name is specified we use the default one.  Allocate