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vfs: fix NULL pointer dereference in fsync_buffers_list() 

Fix NULL pointer dereference in fsync_buffers_list() introduced by recent fix
of races in private_list handling.  Since bh->b_assoc_map has been cleared in
__remove_assoc_queue() we should really use original value stored in the
'mapping' variable.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jan Kara 2008-03-04 14:28:33 -08:00 committed by Linus Torvalds
parent 10ed273f50
commit e3892296de
1 changed files with 1 additions and 1 deletions
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2
fs/buffer.c
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@ -835,7 +835,7 @@ static int fsync_buffers_list(spinlock_t *lock, struct list_head *list)
smp_mb();
if (buffer_dirty(bh)) {
list_add(&bh->b_assoc_buffers,
&bh->b_assoc_map->private_list);
&mapping->private_list);
bh->b_assoc_map = mapping;
}
spin_unlock(lock);