[TIPC] Properly mask header fields

[Max Krasnyansky <maxk@qualcomm.com>]

TIPC code is a bit inconsistent in masking out upper bits of various
message fields when packing them into the headers. For the most part
things seem to be ok but we happened to hit a corner case in our labs
when broadcast counter reached certain value (don't remember exact
details) and was messing up status bits in the header. At which point
the link was busted and required a reset to bring it back up.
It's much safer to apply proper mask in the function that does the
actual packing rather than doing it all over the place, and missing a
few ;-).

Signed-off-by: Max Krasnyansky <maxk@qualcomm.com>
---
 net/tipc/msg.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/net/tipc/msg.h b/net/tipc/msg.h
index 6699aaf..4e681c8 100644
--- a/net/tipc/msg.h
+++ b/net/tipc/msg.h
@@ -72,7 +72,7 @@ static inline void msg_set_bits(struct tipc_msg *m, u32 w,
 				u32 pos, u32 mask, u32 val)
 {
 	u32 word = msg_word(m,w) & ~(mask << pos);
-	msg_set_word(m, w, (word |= (val << pos)));
+	msg_set_word(m, w, (word |= ((val & mask) << pos)));
 }
 
 /* 
-- 
1.4.4.2