Fix the invalid read (heap-buffer-overflow) error in AppendAVA().

patches/nss-appendava-invalid-read.patch

Index: patches/nss-appendava-invalid-read.patch
===================================================================
--- patches/nss-appendava-invalid-read.patch	(revision 0)
+++ patches/nss-appendava-invalid-read.patch	(revision 0)
@@ -0,0 +1,16 @@
+Index: lib/certdb/alg1485.c
+===================================================================
+--- lib/certdb/alg1485.c	(revision 199075)
++++ lib/certdb/alg1485.c	(working copy)
+@@ -1036,8 +1036,10 @@
+     } else {
+ 	/* must truncate the escaped and quoted value */
+ 	char bigTmpBuf[TMPBUF_LEN * 3 + 3];
++	PORT_Assert(valueLen < sizeof tmpBuf);
+ 	rv = escapeAndQuote(bigTmpBuf, sizeof bigTmpBuf,
+-			    (char *)avaValue->data, valueLen, &mode);
++			    (char *)avaValue->data,
++			    PR_MIN(avaValue->len, valueLen), &mode);
+ 
+ 	bigTmpBuf[valueLen--] = '\0'; /* hard stop here */
+ 	/* See if we're in the middle of a multi-byte UTF8 character */