packet: Correct type of PACKET_MAX_LEN

PACKET_MAX_LEN is usually involved in calculations on size_t values - the
type of the iov_len field in struct iovec.  However, being defined bare as
UINT16_MAX, the compiled is likely to assign it a shorter type.  This can
lead to unexpected promotions (or lack thereof).  Add a cast to force the
type to be what we expect.

Fixes: c43972ad6 ("packet: Give explicit name to maximum packet size")
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/packet.h b/packet.h
index dd18461..9061dad 100644
--- a/packet.h
+++ b/packet.h
@@ -9,7 +9,7 @@
 #include <stdbool.h>
 
 /* Maximum size of a single packet stored in pool, including headers */
-#define PACKET_MAX_LEN	UINT16_MAX
+#define PACKET_MAX_LEN	((size_t)UINT16_MAX)
 
 /**
  * struct pool - Generic pool of packets stored in a buffer