svn commit: r213122 - stable/8/sys/dev/ed

[Pyun YongHyeon]

Author: yongari
Date: Fri Sep 24 19:13:43 2010
New Revision: 213122
URL: http://svn.freebsd.org/changeset/base/213122

Log:
  MFC r211721:
    Fix a possible unaligned access to savebyte array.
  
    PR:	kern/122195

Modified:
  stable/8/sys/dev/ed/if_ed.c
Directory Properties:
  stable/8/sys/   (props changed)
  stable/8/sys/amd64/include/xen/   (props changed)
  stable/8/sys/cddl/contrib/opensolaris/   (props changed)
  stable/8/sys/contrib/dev/acpica/   (props changed)
  stable/8/sys/contrib/pf/   (props changed)
  stable/8/sys/dev/xen/xenpci/   (props changed)

Modified: stable/8/sys/dev/ed/if_ed.c
==============================================================================
--- stable/8/sys/dev/ed/if_ed.c	Fri Sep 24 19:11:22 2010	(r213121)
+++ stable/8/sys/dev/ed/if_ed.c	Fri Sep 24 19:13:43 2010	(r213122)
@@ -1462,9 +1462,12 @@ ed_pio_write_mbufs(struct ed_softc *sc, 
 		}
 	} else {
 		/* NE2000s are a pain */
-		unsigned char *data;
+		uint8_t *data;
 		int len, wantbyte;
-		unsigned char savebyte[2];
+		union {
+			uint16_t w;
+			uint8_t b[2];
+		} saveword;
 
 		wantbyte = 0;
 
@@ -1474,9 +1477,9 @@ ed_pio_write_mbufs(struct ed_softc *sc, 
 				data = mtod(m, caddr_t);
 				/* finish the last word */
 				if (wantbyte) {
-					savebyte[1] = *data;
+					saveword.b[1] = *data;
 					ed_asic_outw(sc, ED_NOVELL_DATA,
-						     *(u_short *)savebyte);
+					    saveword.w);
 					data++;
 					len--;
 					wantbyte = 0;
@@ -1490,7 +1493,7 @@ ed_pio_write_mbufs(struct ed_softc *sc, 
 				}
 				/* save last byte, if necessary */
 				if (len == 1) {
-					savebyte[0] = *data;
+					saveword.b[0] = *data;
 					wantbyte = 1;
 				}
 			}
@@ -1498,7 +1501,7 @@ ed_pio_write_mbufs(struct ed_softc *sc, 
 		}
 		/* spit last byte */
 		if (wantbyte)
-			ed_asic_outw(sc, ED_NOVELL_DATA, *(u_short *)savebyte);
+			ed_asic_outw(sc, ED_NOVELL_DATA, saveword.w);
 	}
 
 	/*