bsdacct: fix access to invalid filp in acct_on()
commit df279ca8966c3de83105428e3391ab17690802a9 upstream.
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 <firstname.lastname@example.org>
Signed-off-by: Louis Rilling <email@example.com>
Cc: Al Viro <firstname.lastname@example.org>
Signed-off-by: Andrew Morton <email@example.com>
Signed-off-by: Linus Torvalds <firstname.lastname@example.org>
Signed-off-by: Greg Kroah-Hartman <email@example.com>
1 file changed