If debugfs were to return a non-NULL error for a debugfs call, using that pointer later in debugfs_create_files() would crash.
Fix that by properly checking the pointer before referencing it. Reported-by: Michal Hocko <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- block/blk-mq-debugfs.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c index 90d68760af08..777638f597aa 100644 --- a/block/blk-mq-debugfs.c +++ b/block/blk-mq-debugfs.c @@ -838,6 +838,9 @@ static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = { static bool debugfs_create_files(struct dentry *parent, void *data, const struct blk_mq_debugfs_attr *attr) { + if (IS_ERR_OR_NULL(parent)) + return false; + d_inode(parent)->i_private = data; for (; attr->name; attr++) { -- 2.20.1
