[9/*] [CRYPTO] Remap when walk_out crosses page in crypt()

[Herbert Xu]

Hi:

This is needed so that we can keep the in_place assignment outside the
inner loop.  Without this in pathalogical situations we can start out
having walk_out being different from walk_in, but when walk_out crosses
a page it may converge with walk_in.

Cheers,
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===== cipher.c 1.26 vs edited =====
--- 1.26/crypto/cipher.c	2005-03-22 21:56:21 +11:00
+++ edited/cipher.c	2005-03-22 21:59:53 +11:00
@@ -129,7 +129,9 @@
 			complete_dst(&walk_out, bsize, dst_p, in_place);
 
 			nbytes -= bsize;
-		} while (nbytes && !scatterwalk_across_pages(&walk_in, bsize));
+		} while (nbytes &&
+			 !scatterwalk_across_pages(&walk_in, bsize) &&
+			 !scatterwalk_across_pages(&walk_out, bsize));
 
 		scatterwalk_done(&walk_in, 0, nbytes);
 		scatterwalk_done(&walk_out, 1, nbytes);