blk-mq: protect debugfs_create_files() from failures
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 <mhocko@kernel.org> Reported-and-tested-by: syzbot+b382ba6a802a3d242790@syzkaller.appspotmail.com Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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2c1cf00eea
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36991ca68d
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@ -838,6 +838,9 @@ static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = {
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static bool debugfs_create_files(struct dentry *parent, void *data,
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const struct blk_mq_debugfs_attr *attr)
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{
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if (IS_ERR_OR_NULL(parent))
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return false;
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d_inode(parent)->i_private = data;
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for (; attr->name; attr++) {
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