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>
diff --git a/fs/buffer.c b/fs/buffer.c
index 897cd74..ddfdd2c 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -835,7 +835,7 @@
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);