vfs: fix handling of lock allocation failure in lease-break case

Bruce Fields notes that commit 778fc546f749 ("locks: fix tracking of
inprogress lease breaks") introduced a possible error pointer
dereference on failure to allocate memory.  locks_conflict() will
dereference the passed-in new lease lock structure that may be an error pointer.

This means an open (without O_NONBLOCK set) on a file with a lease
applied (generally only done when Samba or nfsd (with v4) is running)
could crash if a kmalloc() fails.

So instead of playing games with IS_ERROR() all over the place, just
check the allocation failure early.  That makes the code more
straightforward, and avoids this possible bad pointer dereference.

Based-on-patch-by: J. Bruce Fields <bfields@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/locks.c b/fs/locks.c
index 3b0d05d..637694b 100644 (file)
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -1205,6 +1205,8 @@ int __break_lease(struct inode *inode, unsigned int mode)
        int want_write = (mode & O_ACCMODE) != O_RDONLY;
 
        new_fl = lease_alloc(NULL, want_write ? F_WRLCK : F_RDLCK);
+       if (IS_ERR(new_fl))
+               return PTR_ERR(new_fl);
 
        lock_flocks();
 
@@ -1221,12 +1223,6 @@ int __break_lease(struct inode *inode, unsigned int mode)
                if (fl->fl_owner == current->files)
                        i_have_this_lease = 1;
 
-       if (IS_ERR(new_fl) && !i_have_this_lease
-                       && ((mode & O_NONBLOCK) == 0)) {
-               error = PTR_ERR(new_fl);
-               goto out;
-       }
-
        break_time = 0;
        if (lease_break_time > 0) {
                break_time = jiffies + lease_break_time * HZ;
@@ -1284,8 +1280,7 @@ restart:
 
 out:
        unlock_flocks();
-       if (!IS_ERR(new_fl))
-               locks_free_lock(new_fl);
+       locks_free_lock(new_fl);
        return error;
 }