[patch 075/108] crypto: aes-ni - Fix cbc mode IV saving

[Greg KH]

2.6.30-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Huang Ying <ying.huang@xxxxxxxxx>

commit e6efaa025384f86a18814a6b9f4e5d54484ab9ff upstream.

Original implementation of aesni_cbc_dec do not save IV if input
length % 4 == 0. This will make decryption of next block failed.

Signed-off-by: Huang Ying <ying.huang@xxxxxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 arch/x86/crypto/aesni-intel_asm.S |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/arch/x86/crypto/aesni-intel_asm.S
+++ b/arch/x86/crypto/aesni-intel_asm.S
@@ -845,7 +845,7 @@ ENTRY(aesni_cbc_enc)
  */
 ENTRY(aesni_cbc_dec)
 	cmp $16, LEN
-	jb .Lcbc_dec_ret
+	jb .Lcbc_dec_just_ret
 	mov 480(KEYP), KLEN
 	add $240, KEYP
 	movups (IVP), IV
@@ -891,6 +891,7 @@ ENTRY(aesni_cbc_dec)
 	add $16, OUTP
 	cmp $16, LEN
 	jge .Lcbc_dec_loop1
-	movups IV, (IVP)
 .Lcbc_dec_ret:
+	movups IV, (IVP)
+.Lcbc_dec_just_ret:
 	ret


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