2007-07-23  Andreas Schwab  <schwab@suse.de>

	* src/sort.c (fillbuf): Make sure the buffer limit is always
	aligned after the buffer was grown.

diff --git a/src/sort.c b/src/sort.c
index 824dd0d..6024be7 100644
--- a/src/sort.c
+++ b/src/sort.c
@@ -1492,6 +1492,8 @@ fillbuf (struct buffer *buf, FILE *fp, char const *file)
       /* The current input line is too long to fit in the buffer.
 	 Double the buffer size and try again.  */
       buf->buf = X2REALLOC (buf->buf, &buf->alloc);
+      /* Realign buffer limit.  */
+      buf->alloc -= buf->alloc % sizeof (struct line);
     }
 }