bsdacct: fix access to invalid filp in acct_on()

The file opened in acct_on and freshly stored in the ns->bacct struct can
be closed in acct_file_reopen by a concurrent call after we release
acct_lock and before we call mntput(file->f_path.mnt).

Record file->f_path.mnt in a local variable and use this variable only.

Signed-off-by: Renaud Lottiaux <renaud.lottiaux@kerlabs.com>
Signed-off-by: Louis Rilling <louis.rilling@kerlabs.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/acct.c b/kernel/acct.c
index 7afa315..9f33910 100644 (file)
--- a/kernel/acct.c
+++ b/kernel/acct.c
@@ -215,6 +215,7 @@ static void acct_file_reopen(struct bsd_acct_struct *acct, struct file *file,
 static int acct_on(char *name)
 {
        struct file *file;
+       struct vfsmount *mnt;
        int error;
        struct pid_namespace *ns;
        struct bsd_acct_struct *acct = NULL;
@@ -256,11 +257,12 @@ static int acct_on(char *name)
                acct = NULL;
        }
 
-       mnt_pin(file->f_path.mnt);
+       mnt = file->f_path.mnt;
+       mnt_pin(mnt);
        acct_file_reopen(ns->bacct, file, ns);
        spin_unlock(&acct_lock);
 
-       mntput(file->f_path.mnt); /* it's pinned, now give up active reference */
+       mntput(mnt); /* it's pinned, now give up active reference */
        kfree(acct);
 
        return 0;