tree 0bdde729de49ac95858f5429b40419b643fcc1cb
parent 5ebe6afaf0057ac3eaeb98defd5456894b446d22
author Al Viro <viro@zeniv.linux.org.uk> 1431041097 -0400
committer Al Viro <viro@zeniv.linux.org.uk> 1431144755 -0400

namei: d_is_negative() should be checked before ->d_seq validation

Fetching ->d_inode, verifying ->d_seq and finding d_is_negative() to
be true does *not* mean that inode we'd fetched had been NULL - that
holds only while ->d_seq is still unchanged.

Shift d_is_negative() checks into lookup_fast() prior to ->d_seq
verification.

Reported-by: Steven Rostedt <rostedt@goodmis.org>
Tested-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>