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>

1 files changed, 3 insertions, 2 deletions

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index f50253c2279d..78ee681465af 100644
--- 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