3.16.80-rc1 review patch. If anyone has any objections, please let me know.
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From: Roberto Bergantinos Corpas rbergant@redhat.com
commit 03d9a9fe3f3aec508e485dd3dcfa1e99933b4bdb upstream.
According to MS-CIFS specification MID 0xFFFF should not be used by the CIFS client, but we actually do. Besides, this has proven to cause races leading to oops between SendReceive2/cifs_demultiplex_thread. On SMB1, MID is a 2 byte value easy to reach in CurrentMid which may conflict with an oplock break notification request coming from server
Signed-off-by: Roberto Bergantinos Corpas rbergant@redhat.com Reviewed-by: Ronnie Sahlberg lsahlber@redhat.com Reviewed-by: Aurelien Aptel aaptel@suse.com Signed-off-by: Steve French stfrench@microsoft.com Signed-off-by: Ben Hutchings ben@decadent.org.uk --- fs/cifs/smb1ops.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/fs/cifs/smb1ops.c +++ b/fs/cifs/smb1ops.c @@ -180,6 +180,9 @@ cifs_get_next_mid(struct TCP_Server_Info /* we do not want to loop forever */ last_mid = cur_mid; cur_mid++; + /* avoid 0xFFFF MID */ + if (cur_mid == 0xffff) + cur_mid++;
/* * This nested loop looks more expensive than it is.