tree 049b895e905cddeec0580388b636ca965b90ec8a
parent 95ba7362105646523ee712fd252ec2e34ccbec15
author Jeff Layton <jlayton@redhat.com> 1187925411 +0000
committer Steve French <sfrench@us.ibm.com> 1187925411 +0000

[CIFS] Byte range unlock request to non-Unix server can unlock too much

On a mount without posix extensions enabled, when an unlock request is
made, the client can release more than is intended. To reproduce, on a
CIFS mount without posix extensions enabled:

1) open file
2) do fcntl lock: start=0 len=1
3) do fcntl lock: start=2 len=1
4) do fcntl unlock: start=0 len=1

...on the unlock call the client sends an unlock request to the server
for both locks. The problem is a bad test in cifs_lock.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>