From: Jeff Layton <jlayton@redhat.com>
Date: Fri, 24 Aug 2007 03:16:51 +0000 (+0000)
Subject: [CIFS] Byte range unlock request to non-Unix server can unlock too much
X-Git-Tag: v2.6.24-rc1~138^2~48
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=39db810cb6c1e7d1f2e43ae38b437b7ee72fe815;p=pandora-kernel.git

[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>
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